Purpose-Built for UK Watch Dealers
Inventory management software for pre-owned and vintage watch dealers. Track movement, case material, reference and serial numbers, service history, and margins on every piece. Manage your stock across Shopify, marketplaces, and in-person at fairs from one place. Built by a former UK dealer who spent years wrestling with generic tools.
Inventory
6 items
Art Deco Diamond Ring
JWL-2026-0089
Cartier Tank Watch
WCH-2026-0034
Georgian Silver Candelabra
ANT-2026-0056
Hermès Birkin 25
HBG-2026-0012
Edwardian Sapphire Pendant
JWL-2026-0091
Rolex Datejust 1601
WCH-2026-0035
Watch dealing has unique demands that generic inventory software simply cannot handle. Spreadsheets and off-the-shelf tools leave gaps that cost you time, money, and compliance.
A vintage Rolex Submariner needs reference number, serial, movement calibre, dial variant, and service history. A modern Omega needs box and papers status. A pocket watch needs case material and movement details. Generic software forces every item into the same rigid structure, so you end up with messy workarounds or missing information.
Buyers of pre-owned and vintage watches expect transparency about authenticity, service history, and prior ownership. Without a system that links every piece to its documentation, signals, and chain of ownership, answering provenance questions becomes a paper trail of guesswork.
Most pre-owned watch stock comes from private sellers, making the Margin Scheme essential. Tracking which watches qualify, calculating VAT at 1/6 of the margin, and generating HMRC-compliant records requires precision that manual methods cannot guarantee.
Watch dealers list on Shopify, on marketplaces like Chrono24 or Watchfinder, and sell in person at watch fairs and shows. Keeping stock accurate across every channel when each watch is unique means constant manual updates and the risk of selling something twice.
Watch dealer inventory software designed around the way UK watch dealers actually work.
Build templates with the fields that matter — movement type, case material, case size, bracelet or strap material, reference number, serial number, service history, and papers/box completeness. A vintage watch template can differ from a modern one. You decide what to track.
GemJam tracks the VAT status of every purchase and calculates Margin Scheme VAT automatically when watches sell. No manual formulas, no eligibility guesswork, no compliance gaps.
List watches on Shopify directly from GemJam. When a piece sells on any channel, your inventory updates everywhere automatically. eBay integration is in development. Marketplace bridging tools for sites such as Chrono24, Watchfinder, and Bezel are on the roadmap as future integrations — bulk-export listings without retyping every reference.
Log every service against the watch record — date, watchmaker, work carried out, parts replaced, and cost. When you come to sell, the full service history travels with the piece and directly supports the price you can achieve.
PUR-2026-0042
Hatton Garden Estates · 15 Feb 2026
Subtotal
£8,250.00
VAT
£0.00
Margin Scheme
Total
£8,250.00
Line Items
Art Deco Diamond Ring, c.1925
JWL-2026-0089
£3,450.00
AvailableVictorian Pearl Brooch
JWL-2026-0090
£1,800.00
SoldCartier Tank Watch, 1970s
WCH-2026-0034
£3,000.00
AvailableMost watch dealers carry a mix — vintage Rolex one week, a modern Grand Seiko the next, a tray of pocket watches at the next fair. GemJam lets you create custom templates with different fields for each category, so every watch captures the detail buyers expect.
Track movement type (automatic, quartz, manual), calibre, jewels, complications, and beat rate. Filter your stock by movement when a customer wants something specific, or pull a report of every chronograph in inventory.
Capture case material (steel, gold, platinum, titanium), case size and thickness, dial colour and signature, bracelet or strap material, and bezel type. Calculated fields can mask serial numbers on public listings while keeping the full number in your records.
Record reference number, serial number, year of manufacture, and the completeness of the set — box, papers, certificate, service records, hangtags, and any third-party authentication reports. Buyers of high-value watches expect this level of documentation.
Every watch links to its purchase record and the contact you bought from. Track where each piece came from, what you paid, prior ownership, and any auction or estate history — giving buyers the provenance details they expect when paying serious money.
Most pre-owned watch stock comes from private sellers, collectors, and other margin scheme dealers. The VAT Margin Scheme lets you pay VAT only on the profit margin rather than the full selling price. GemJam handles this automatically.
Automatic eligibility tracking based on seller VAT status
VAT calculated at 1/6 (16.67%) of the profit margin on eligible watches
HMRC-compliant Stock Book, VAT Return Report, and dual invoice formats
Export to Xero-compatible format, ready for forwarding to Dext
How purpose-built watch dealer software compares to the alternatives.
| Feature | GemJam | Spreadsheets | Generic Inventory | Dedicated Dealer Software |
|---|---|---|---|---|
| Custom templates and fields | Yes | Manual columns | Limited | Varies |
| Reference and serial tracking | Yes | Manual columns | No | Varies |
| Service history per item | Yes | Manual columns | No | Varies |
| VAT Margin Scheme | Yes | Manual formulas | No | Yes |
| Multi-channel (Shopify; eBay coming soon) | Yes | No | Varies | No |
| Photo management | Yes | No | Yes | Yes |
| Accounting export (Xero/Dext) | Yes | No | Varies | Limited |
| Unique item management | Yes | Limited | Bulk-focused | Yes |
Practical answers for UK watch dealers considering GemJam.
GemJam lets you build custom item templates with the fields that matter for watches — movement type (automatic, quartz, manual), case material, case size, bracelet or strap material, reference number, serial number, service history, and papers/box completeness. A vintage Rolex template can look different from a modern Omega template, and each captures exactly the detail your stock and your buyers expect.
GemJam does not authenticate watches for you — that judgement is yours. What it does do is give you the structure to record every signal your buyers ask for: reference number, serial number, movement details, dial signature, case markings, service history, and links to original papers, certificates, or third-party authentication reports. Every record is searchable, so you can answer provenance questions in seconds rather than rummaging through files.
Most pre-owned watch stock comes from private sellers or other margin scheme dealers, making the Margin Scheme essential. GemJam tracks the VAT status of every purchase automatically. When you buy a watch from a private individual or non-VAT-registered seller, the item is flagged as Margin Scheme eligible. When sold, GemJam calculates VAT at 1/6 of the profit margin rather than the full selling price, and generates HMRC-compliant reports including the Stock Book, VAT Return Report, and dual invoice formats.
Yes. GemJam pushes your listings to Shopify and updates inventory across channels when a watch sells. eBay integration is in development. Marketplace bridging tools for sites like Chrono24, Watchfinder, and Bezel are on our roadmap as future integrations — today you would export listings or copy details manually. For in-person sales at watch fairs, you record the sale on your phone and your inventory updates everywhere instantly.
Yes. Each watch has its own record, so you can log every service — date, watchmaker, work carried out, parts replaced, and cost. When you come to sell, the full service history travels with the item. Buyers of high-value watches expect this transparency, and it directly affects the price you can achieve.
Generic inventory systems assume interchangeable units with fixed prices — they are built for warehouses and retail, not dealers of one-of-a-kind watches. GemJam treats every watch as unique, with its own purchase price, reference and serial number, movement details, condition, and margin. It handles VAT Margin Scheme calculations natively, pushes listings to Shopify (eBay coming soon), and generates HMRC-compliant documentation. It was built by a former UK dealer who understands the specific challenges of trading in unique pieces.
GemJam is built for dealers of all unique items. If you carry jewellery, antiques, or designer handbags alongside watches, you can manage everything from one place.
GemJam is watch dealer software that tracks movement, reference, serial, service history, and margins while keeping you HMRC-compliant. Join the waiting list for early access.