Shopify Watch & Luxury Timepiece Schema — Movement Type, Water Resistance, Case Diameter & COSC Certification Structured Data

Why Watches Require Specialized Structured Data

Watches are a category where expert shoppers apply the most granular filters of any consumer product. Movement type alone divides the entire market — a buyer searching "automatic watch" will not accept a quartz, and vice versa. Water resistance rating determines whether a watch can accompany a dive, a swim, or only handle rain. Case diameter is a dealbreaker for wrist fit. These filters are impossible for an AI agent to apply if the data lives only in product descriptions rather than structured schema fields.

Shopify's default Product JSON-LD provides name, price, availability, and SKU. It does not emit movement type, water resistance depth, case diameter, crystal material, or chronograph complication data. This means every watch query with a technical filter — the vast majority of watch queries — receives no signal from your product pages and cannot be matched by AI shopping agents parsing your schema.

Watch queries and the structured data they require

Section 1 — Automatic Dive Watch: Full Product Schema

The following example shows a complete Product JSON-LD for a 42mm automatic dive watch. Every additionalProperty reflects a real horology data point that AI agents use to filter watch queries. The hasCertification block includes both ISO 6425 (diver's watch standard, mandatory for a watch to be marketed as a diver's watch) and the optional COSC chronometer certification shown as a conditional comment.

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Pelagic 300 — 42mm Automatic Dive Watch, ETA 2824-2, 300m Water Resistance",
  "description": "Swiss automatic diver's watch featuring an ETA 2824-2 movement with 38-hour power reserve. 42mm 316L stainless steel case with sapphire crystal (double AR coating), screw-down crown, unidirectional rotating bezel. 300m / 30 ATM water resistance — ISO 6425 certified. Lug width 20mm.",
  "url": "https://example-watches.myshopify.com/products/pelagic-300-automatic-dive",
  "brand": {
    "@type": "Brand",
    "name": "Pelagic Watch Co."
  },
  "material": "316L stainless steel case and bracelet, sapphire crystal",
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Movement Type",
      "value": "Automatic",
      "description": "Mechanical self-winding movement — no battery required; rotor winds mainspring via wearer's wrist motion"
    },
    {
      "@type": "PropertyValue",
      "name": "Movement Caliber",
      "value": "ETA 2824-2"
    },
    {
      "@type": "PropertyValue",
      "name": "Movement Frequency",
      "value": "28800",
      "unitCode": "2M",
      "description": "28,800 bph / 4 Hz — beats per hour indicating balance wheel frequency; higher frequency = smoother sweep"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Diameter",
      "value": "42",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Thickness",
      "value": "12",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Material",
      "value": "Stainless Steel 316L",
      "description": "316L marine-grade stainless steel — highest corrosion resistance in the mid-range segment; Rolex uses 904L superalloy"
    },
    {
      "@type": "PropertyValue",
      "name": "Crystal Material",
      "value": "Sapphire",
      "description": "Scratch-resistant sapphire crystal (9 Mohs hardness) with anti-reflective coating on both inner and outer surfaces for glare-free legibility underwater"
    },
    {
      "@type": "PropertyValue",
      "name": "Crystal Anti-Reflective",
      "value": "Double-sided AR coating"
    },
    {
      "@type": "PropertyValue",
      "name": "Water Resistance",
      "value": "300",
      "unitCode": "MTR",
      "description": "300m / 30 ATM / 30 BAR water resistance — suitable for recreational scuba diving; not rated for saturation diving or mixed-gas professional diving (ISO 6425 diver's watch standard)"
    },
    {
      "@type": "PropertyValue",
      "name": "Lug Width",
      "value": "20",
      "unitCode": "MMT",
      "description": "20mm lug width — compatible with any standard 20mm strap (NATO, rubber dive strap, leather, metal bracelet)"
    },
    {
      "@type": "PropertyValue",
      "name": "Power Reserve",
      "value": "38",
      "unitCode": "HUR"
    },
    {
      "@type": "PropertyValue",
      "name": "Dial Color",
      "value": "Black"
    },
    {
      "@type": "PropertyValue",
      "name": "Bezel Type",
      "value": "Unidirectional rotating bezel",
      "description": "ISO 6425 diver's watch requirement — 60-minute graduated unidirectional rotating bezel with luminous marker at 12 o'clock; can only rotate counterclockwise so accidental nudges cannot add time to a dive"
    },
    {
      "@type": "PropertyValue",
      "name": "Crown Type",
      "value": "Screw-down crown",
      "description": "Screw-down crown for water resistance integrity — always unscrew to set time, then resecure fully before any water entry"
    },
    {
      "@type": "PropertyValue",
      "name": "Lume",
      "value": "Swiss Super-LumiNova Grade X1",
      "description": "BGW9 blue-glow Super-LumiNova applied to hour indices and hands; Grade X1 is the highest-output commercially available grade"
    }
  ],
  "hasCertification": [
    {
      "@type": "Certification",
      "name": "ISO 6425 Diver's Watch Certification",
      "issuedBy": {
        "@type": "Organization",
        "name": "International Organization for Standardization (ISO)",
        "url": "https://www.iso.org"
      },
      "description": "ISO 6425 diver's watch standard: requires water resistance to rated depth, unidirectional rotating bezel, legibility underwater, magnetic resistance, shock resistance, and strap robustness testing"
    }
    /*
      COSC block — inject only when watch.cosc_certified metafield = "true":
      {
        "@type": "Certification",
        "name": "COSC Chronometer Certification",
        "issuedBy": {
          "@type": "Organization",
          "name": "Contrôle Officiel Suisse des Chronomètres (COSC)",
          "url": "https://www.cosc.swiss"
        },
        "description": "COSC-certified movement tested for accuracy of -4/+6 seconds per day across 16 days, 5 positions, 3 temperatures"
      }
    */
  ],
  "compatibleWith": [
    {
      "@type": "Product",
      "name": "20mm NATO Strap — Olive Drab",
      "url": "https://example-watches.myshopify.com/products/20mm-nato-strap-olive-drab"
    },
    {
      "@type": "Product",
      "name": "20mm Rubber Dive Strap — Black",
      "url": "https://example-watches.myshopify.com/products/20mm-rubber-dive-strap-black"
    }
  ],
  "offers": {
    "@type": "Offer",
    "priceCurrency": "USD",
    "price": "649.00",
    "availability": "https://schema.org/InStock",
    "url": "https://example-watches.myshopify.com/products/pelagic-300-automatic-dive"
  }
}
</script>

Key points on this schema. The Water Resistance PropertyValue includes all three equivalent notations (300m, 30 ATM, 30 BAR) in the description because AI agents treat each as a separate potential filter. The Case Material value uses the precise grade "Stainless Steel 316L" rather than the generic "Stainless Steel" — this matters for luxury-tier filtering where 904L superalloy is a distinct signal. The ISO 6425 certification in hasCertification distinguishes a true certified diver's watch from a watch that merely claims a water resistance depth.

Section 2 — Solar-Powered Quartz Watch: Movement Variants

Quartz movement variants — standard battery quartz, solar-powered, kinetic, and Spring Drive — each require precise movement type values. Collapsing all non-mechanical watches into "Quartz" loses the signal that drives "no battery replacement ever" queries and "eco-drive solar" brand-adjacent searches.

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Solaris Ti — Solar-Powered Titanium Quartz Watch, Perpetual Calendar, Eco-Drive E168",
  "description": "Solar-powered titanium quartz watch with Citizen Eco-Drive E168 movement. Charges from any light source — full charge runs 6 months in total darkness. Case: 39mm grade 5 titanium (30% lighter than steel). Hardlex mineral crystal. Perpetual calendar complication accurate through 2100. 100m / 10 ATM water resistance.",
  "url": "https://example-watches.myshopify.com/products/solaris-ti-solar-titanium",
  "brand": {
    "@type": "Brand",
    "name": "Solaris Watch Co."
  },
  "material": "Grade 5 titanium case and bracelet, Hardlex mineral crystal",
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Movement Type",
      "value": "Solar-Powered Quartz",
      "description": "Citizen Eco-Drive solar movement — charges from any light source (natural or artificial), no battery replacement ever; full charge provides 6-month power reserve in total darkness"
    },
    {
      "@type": "PropertyValue",
      "name": "Movement Caliber",
      "value": "E168"
    },
    {
      "@type": "PropertyValue",
      "name": "Accuracy",
      "value": "±15",
      "unitCode": "SEC",
      "description": "±15 seconds per month — standard quartz accuracy. COSC quartz chronometer standard: ±0.07 seconds/day = ±2.1 seconds/month. Standard battery quartz: ±15 sec/month. GPS-synced quartz: ±0 seconds"
    },
    {
      "@type": "PropertyValue",
      "name": "Power Reserve",
      "value": "4380",
      "unitCode": "HUR",
      "description": "6-month power reserve (4,380 hours) in total darkness at full charge — built-in power reserve indicator sub-dial"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Diameter",
      "value": "39",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Thickness",
      "value": "9",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Material",
      "value": "Titanium",
      "description": "Grade 5 (Ti-6Al-4V) titanium alloy — approximately 30% lighter than equivalent 316L stainless steel at equivalent strength; hypoallergenic and non-magnetic"
    },
    {
      "@type": "PropertyValue",
      "name": "Crystal Material",
      "value": "Hardlex Mineral",
      "description": "Hardlex is Seiko's proprietary tempered mineral crystal — harder than standard mineral glass (7 Mohs vs 5–7 Mohs range) but softer than sapphire (9 Mohs). Resistant to shattering; more scratch-prone than sapphire. Used across Seiko and Citizen mid-range price points."
    },
    {
      "@type": "PropertyValue",
      "name": "Water Resistance",
      "value": "100",
      "unitCode": "MTR",
      "description": "100m / 10 ATM / 10 BAR water resistance — suitable for swimming and snorkeling; not rated for scuba diving"
    },
    {
      "@type": "PropertyValue",
      "name": "Complication Type",
      "value": "Perpetual Calendar",
      "description": "Perpetual calendar accurate through 2100 — automatically accounts for month lengths and leap years without manual date correction"
    },
    {
      "@type": "PropertyValue",
      "name": "Lug Width",
      "value": "20",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Dial Color",
      "value": "Blue Sunburst"
    }
  ],
  "offers": {
    "@type": "Offer",
    "priceCurrency": "USD",
    "price": "395.00",
    "availability": "https://schema.org/InStock",
    "url": "https://example-watches.myshopify.com/products/solaris-ti-solar-titanium"
  }
}
</script>

Movement type value reference

Section 3 — Chronograph Complication Schema

A chronograph is the most common complication in sports watches and the most frequently filtered complication in AI queries ("chronograph watch under $500," "COSC certified column wheel chronograph"). The schema below shows how to express the chronograph and its sub-components as discrete additionalProperty values — one property per measurable attribute, not a single bundled string.

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Apex Chrono — 41mm Automatic Chronograph, Column Wheel, Tachymeter",
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Movement Type",
      "value": "Automatic",
      "description": "Mechanical self-winding chronograph movement — integrated column wheel chronograph module"
    },
    {
      "@type": "PropertyValue",
      "name": "Complication Type",
      "value": "Chronograph",
      "description": "Stopwatch complication via crown/pushers — measures elapsed time independently of the timekeeping function"
    },
    {
      "@type": "PropertyValue",
      "name": "Sub-dial Count",
      "value": "3",
      "description": "Three chronograph sub-dials: running seconds (9 o'clock), 30-minute counter (3 o'clock), 12-hour counter (6 o'clock)"
    },
    {
      "@type": "PropertyValue",
      "name": "Tachymeter",
      "value": "Tachymeter scale",
      "description": "Outer bezel tachymeter scale for calculating speed over a known distance — start chronograph at mile/km marker, stop at next; bezel reads speed in units/hour"
    },
    {
      "@type": "PropertyValue",
      "name": "Pushers",
      "value": "2 — standard chronograph pushers at 2 o'clock and 4 o'clock",
      "description": "2 o'clock pusher: start/stop chronograph. 4 o'clock pusher: reset to zero. Both pushers are non-screw-down on this model — do not operate while submerged."
    },
    {
      "@type": "PropertyValue",
      "name": "Column Wheel",
      "value": "Column wheel chronograph",
      "description": "Column wheel mechanism controls chronograph start/stop/reset with precisely indexed steps — smoother, lighter pusher action vs cam-operated lever chronographs; column wheel is a recognized indicator of movement quality and finishing level"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Diameter",
      "value": "41",
      "unitCode": "MMT"
    },
    {
      "@type": "PropertyValue",
      "name": "Case Thickness",
      "value": "13",
      "unitCode": "MMT",
      "description": "13mm case thickness — chronograph movements add 1-2mm vs equivalent non-chronograph calibers due to additional layer for chronograph module"
    },
    {
      "@type": "PropertyValue",
      "name": "Crystal Material",
      "value": "Sapphire",
      "description": "Flat sapphire crystal with single-sided anti-reflective coating on inner surface"
    },
    {
      "@type": "PropertyValue",
      "name": "Water Resistance",
      "value": "100",
      "unitCode": "MTR",
      "description": "100m / 10 ATM / 10 BAR — suitable for swimming; pushers should not be operated underwater"
    },
    {
      "@type": "PropertyValue",
      "name": "Lug Width",
      "value": "20",
      "unitCode": "MMT"
    }
  ]
}
</script>

Section 4 — Water Resistance Reference Table

Water resistance ratings are expressed three ways — ATM (atmospheres), BAR, and meters — and AI agents may receive queries using any of the three. Your additionalProperty description must include all three equivalents. The table below shows the full rating ladder and appropriate use cases.

How to encode the ATM equivalents

The canonical PropertyValue for water resistance should use meters as the numeric value (since meters is the most internationally recognized unit for dive depth) and include ATM and BAR equivalents in the description field:

{
  "@type": "PropertyValue",
  "name": "Water Resistance",
  "value": "100",
  "unitCode": "MTR",
  "description": "100m / 10 ATM / 10 BAR water resistance — suitable for swimming and snorkeling. Not rated for scuba diving. ISO unit code MTR = meters."
}

Section 5 — Crystal Material Reference Table

Crystal material is a high-priority filter for buyers comparing scratch resistance, optical clarity, and price tier. AI agents match "scratch-resistant watch crystal" to sapphire, "vintage look crystal" to acrylic/Hesalite, and "mid-range Japanese watch" to Hardlex or mineral. Structuring crystal material as an additionalProperty enables all three query patterns.

Crystal material PropertyValue encoding

{
  "@type": "PropertyValue",
  "name": "Crystal Material",
  "value": "Sapphire",
  "description": "Scratch-resistant sapphire crystal (9 Mohs hardness) with double-sided anti-reflective coating. Industry standard for Swiss luxury watches. Brittle under sharp lateral impact — impact resistance is lower than mineral or acrylic."
}

/* Mid-range mineral example */
{
  "@type": "PropertyValue",
  "name": "Crystal Material",
  "value": "Hardlex Mineral",
  "description": "Hardlex is Seiko's proprietary tempered mineral crystal — harder than standard mineral glass, scratch-resistant for everyday use, and more shatter-resistant than sapphire."
}

/* Vintage / Hesalite example */
{
  "@type": "PropertyValue",
  "name": "Crystal Material",
  "value": "Hesalite Acrylic",
  "description": "Hesalite is Omega's trade name for high-clarity acrylic crystal — used in the Speedmaster Moonwatch Professional by original NASA specification. Scratches easily but can be polished; will not shatter on impact."
}

Section 6 — Strap Compatibility with compatibleWith

Strap compatibility is determined by a single physical measurement: lug width. Any 20mm strap fits any watch with a 20mm lug width, regardless of brand. Structuring this linkage in schema enables AI agents to answer "compatible 20mm straps for [watch model]" and to surface strap accessories alongside watch PDPs in accessory queries.

On the watch product: declare lug width and link compatible straps

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Pelagic 300 — 42mm Automatic Dive Watch",
  "url": "https://example-watches.myshopify.com/products/pelagic-300-automatic-dive",
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Lug Width",
      "value": "20",
      "unitCode": "MMT",
      "description": "20mm lug width — fits any standard 20mm strap: NATO, leather, rubber, and metal bracelets. The lug width is the only compatibility dimension for strap swapping."
    }
  ],
  "compatibleWith": [
    {
      "@type": "Product",
      "name": "20mm NATO Strap — Olive Drab",
      "url": "https://example-watches.myshopify.com/products/20mm-nato-strap-olive-drab",
      "additionalProperty": [
        {
          "@type": "PropertyValue",
          "name": "Strap Width",
          "value": "20",
          "unitCode": "MMT"
        }
      ]
    },
    {
      "@type": "Product",
      "name": "20mm Rubber Dive Strap — Black",
      "url": "https://example-watches.myshopify.com/products/20mm-rubber-dive-strap-black",
      "additionalProperty": [
        {
          "@type": "PropertyValue",
          "name": "Strap Width",
          "value": "20",
          "unitCode": "MMT"
        }
      ]
    }
  ]
}

On the strap product: use isAccessoryOrSparePartFor

On the strap's own product page, use isAccessoryOrSparePartFor to link back to compatible watches. Combine with a matching Strap Width additionalProperty so AI agents can verify dimensional compatibility without traversing to the watch product first.

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "20mm NATO Strap — Olive Drab",
  "url": "https://example-watches.myshopify.com/products/20mm-nato-strap-olive-drab",
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Strap Width",
      "value": "20",
      "unitCode": "MMT",
      "description": "20mm strap width — compatible with any watch with a 20mm lug width. No tools required to swap: slide existing strap out via spring bars, slide NATO under."
    },
    {
      "@type": "PropertyValue",
      "name": "Strap Material",
      "value": "Nylon NATO",
      "description": "Military-spec nylon weave — machine washable, waterproof, extremely durable. Single-pass NATO design keeps watch secure even if one spring bar fails."
    },
    {
      "@type": "PropertyValue",
      "name": "Strap Length",
      "value": "280",
      "unitCode": "MMT",
      "description": "280mm total length — standard NATO strap length fits most wrist sizes from 155mm to 210mm circumference"
    }
  ],
  "isAccessoryOrSparePartFor": [
    {
      "@type": "Product",
      "name": "Pelagic 300 — 42mm Automatic Dive Watch",
      "url": "https://example-watches.myshopify.com/products/pelagic-300-automatic-dive"
    }
  ]
}

The lug width is the canonical compatibility key. An AI agent answering "best NATO strap for a watch with 20mm lugs" can verify compatibility from either the watch's compatibleWith block or the strap's isAccessoryOrSparePartFor + Strap Width combination — without relying on textual description matching.

Section 7 — Liquid Implementation: watch.* Metafield Namespace

Implement all watch-specific properties under a watch metafield namespace in Shopify. The following Liquid template covers the full 14-field namespace, with conditionals for the COSC certification block (only injected when explicitly set) and the chronograph section (only injected when the complication type includes "Chronograph").

Metafield definitions — watch.* namespace

Liquid template with conditionals

{% comment %}
  watch-schema.liquid — inject in theme.liquid or product.liquid
  All watch.* metafields must be defined in Shopify Admin > Settings > Custom data
{% endcomment %}

{% assign mf = product.metafields.watch %}

{% if mf.movement_type != blank %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": {{ product.title | json }},
  "url": "{{ shop.url }}{{ product.url }}",
  "description": {{ product.description | strip_html | json }},
  "brand": {
    "@type": "Brand",
    "name": {{ product.vendor | json }}
  },
  "offers": {
    "@type": "Offer",
    "priceCurrency": {{ cart.currency.iso_code | json }},
    "price": "{{ product.price | money_without_currency }}",
    "availability": "{% if product.available %}https://schema.org/InStock{% else %}https://schema.org/OutOfStock{% endif %}",
    "url": "{{ shop.url }}{{ product.url }}"
  },
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "Movement Type",
      "value": {{ mf.movement_type | json }}
    }{% if mf.movement_caliber != blank %},
    {
      "@type": "PropertyValue",
      "name": "Movement Caliber",
      "value": {{ mf.movement_caliber | json }}
    }{% endif %}{% if mf.movement_frequency_bph != blank %},
    {
      "@type": "PropertyValue",
      "name": "Movement Frequency",
      "value": "{{ mf.movement_frequency_bph }}",
      "unitCode": "2M",
      "description": "{{ mf.movement_frequency_bph }} bph — beats per hour of balance wheel"
    }{% endif %}{% if mf.case_diameter_mm != blank %},
    {
      "@type": "PropertyValue",
      "name": "Case Diameter",
      "value": "{{ mf.case_diameter_mm }}",
      "unitCode": "MMT"
    }{% endif %}{% if mf.case_thickness_mm != blank %},
    {
      "@type": "PropertyValue",
      "name": "Case Thickness",
      "value": "{{ mf.case_thickness_mm }}",
      "unitCode": "MMT"
    }{% endif %}{% if mf.case_material != blank %},
    {
      "@type": "PropertyValue",
      "name": "Case Material",
      "value": {{ mf.case_material | json }}
    }{% endif %}{% if mf.crystal_material != blank %},
    {
      "@type": "PropertyValue",
      "name": "Crystal Material",
      "value": {{ mf.crystal_material | json }}
    }{% endif %}{% if mf.water_resistance_m != blank %},
    {
      "@type": "PropertyValue",
      "name": "Water Resistance",
      "value": "{{ mf.water_resistance_m }}",
      "unitCode": "MTR",
      "description": "{{ mf.water_resistance_m }}m / {{ mf.water_resistance_atm }} ATM / {{ mf.water_resistance_atm }} BAR water resistance"
    }{% endif %}{% if mf.lug_width_mm != blank %},
    {
      "@type": "PropertyValue",
      "name": "Lug Width",
      "value": "{{ mf.lug_width_mm }}",
      "unitCode": "MMT",
      "description": "{{ mf.lug_width_mm }}mm lug width — compatible with standard {{ mf.lug_width_mm }}mm straps"
    }{% endif %}{% if mf.power_reserve_hours != blank %},
    {
      "@type": "PropertyValue",
      "name": "Power Reserve",
      "value": "{{ mf.power_reserve_hours }}",
      "unitCode": "HUR"
    }{% endif %}{% if mf.dial_color != blank %},
    {
      "@type": "PropertyValue",
      "name": "Dial Color",
      "value": {{ mf.dial_color | json }}
    }{% endif %}{% if mf.bezel_type != blank %},
    {
      "@type": "PropertyValue",
      "name": "Bezel Type",
      "value": {{ mf.bezel_type | json }}
    }{% endif %}{% for complication in mf.complication_type %},
    {
      "@type": "PropertyValue",
      "name": "Complication Type",
      "value": {{ complication | json }}{% if complication == "Chronograph" %},
      "description": "Stopwatch complication via crown/pushers — measures elapsed time independently of timekeeping"{% endif %}
    }{% endfor %}
  ],
  "hasCertification": [
    {% if mf.iso_6425_certified == true %}
    {
      "@type": "Certification",
      "name": "ISO 6425 Diver's Watch Certification",
      "issuedBy": {
        "@type": "Organization",
        "name": "International Organization for Standardization (ISO)",
        "url": "https://www.iso.org"
      },
      "description": "ISO 6425 diver's watch standard — requires verified water resistance, unidirectional bezel, shock and magnetic resistance"
    }{% if mf.cosc_certified == true %},{% endif %}
    {% endif %}
    {% comment %}
      COSC block — only inject when watch.cosc_certified metafield is explicitly true.
      Never inject for watches claiming 'chronometer-grade' without independent COSC testing.
    {% endcomment %}
    {% if mf.cosc_certified == true %}
    {
      "@type": "Certification",
      "name": "COSC Chronometer Certification",
      "issuedBy": {
        "@type": "Organization",
        "name": "Contrôle Officiel Suisse des Chronomètres (COSC)",
        "url": "https://www.cosc.swiss"
      },
      "description": "COSC-certified movement tested for accuracy of -4/+6 seconds per day (mechanical) across 16 days, 5 positions, 3 temperatures. Quartz COSC standard: ±0.07 seconds/day."
    }
    {% endif %}
  ]
}
</script>
{% endif %}

Section 8 — 5 Common Structured Data Mistakes for Watch Listings

1. Mistake 1 Using "water resistant 100m" without specifying ATM equivalent
   AI agents parse "100m" and "10 ATM" as entirely separate filter tokens. A query for "10 ATM dive-safe watch" will not match a product whose schema only contains "value": "100", "unitCode": "MTR" without the ATM/BAR equivalents in the description. Always include all three notations in the description field: "description": "100m / 10 ATM / 10 BAR water resistance".
2. Mistake 2 Omitting movement type entirely
   Movement type (Automatic vs Quartz vs Manual Wind) is the number one filter in watch AI queries. It divides the entire market — automatic buyers will not accept a quartz recommendation, and the price distribution between movement types is dramatic. A watch product without a Movement Type additionalProperty is invisible to every movement-filtered query, which is the majority of watch searches.
3. Mistake 3 Providing case diameter without case thickness
   Dress watch buyers filter on both dimensions — diameter for wrist fit and thickness for whether the watch fits under a shirt cuff. A 42mm watch at 9mm thickness wears completely differently than a 42mm chronograph at 14mm thickness. Both values should be present as separate additionalProperty entries. Omitting case thickness leaves dress-watch and slim-profile queries unserviced.
4. Mistake 4 Missing lug width — strap compatibility cannot be linked
   Without a structured Lug Width additionalProperty, AI agents cannot verify strap compatibility or surface your strap accessories alongside watch PDPs. Lug width is the physical interface dimension that makes strap swapping mechanically verifiable. Cross-sell opportunities for NATO straps, rubber dive straps, and metal bracelets are entirely lost when lug width is absent from the schema.
5. Mistake 5 Using generic "stainless steel" without specifying the alloy grade
   316L stainless steel and 904L superalloy stainless (used by Rolex) are different materials with measurably different corrosion resistance, hardness, and price positioning. An AI agent answering a luxury watch query filters "904L stainless" as a distinct value from "316L stainless." Using the generic value "Stainless Steel" collapses this distinction and removes your 904L product from luxury-tier AI recommendations. The same principle applies to titanium grades (Grade 2 vs Grade 5 / Ti-6Al-4V) and to ceramic case materials.

Related Structured Data Guides

• Shopify Jewelry & Gemstone Schema — our jewelry and gemstone schema guide covering GIA certificates, 4Cs, metal purity, and ring size SizeSpecification
• Shopify Visual Artwork & Collectibles Schema — our collectibles schema guide for limited editions, provenance, and authentication certificates
• Shopify ProductGroup Variant Schema — ProductGroup variant implementation for watches with multiple strap or dial color options
• Ecommerce Product Condition Structured Data — markup for pre-owned and vintage watches with condition grades
• Shopify Metafields for AI Agents — complete metafield namespace strategy for product-specific structured data