What is your jewellery
really worth?
Jewellery value combines the stones, the metal and the maker. Assay benchmarks diamonds against the trade standard and finished pieces against auction results, for a fair value you can act on.
How to value jewellery
For loose diamonds, the 4Cs (carat, cut, colour, clarity) and certification set value against the trade benchmark — the blended sold-comp data from eBay and reference databases list and RapNet index.
For finished jewellery, the maker and design matter as much as the materials — a signed piece by a major house can far exceed its intrinsic stone-and-metal value.
Assay benchmarks diamonds against the trade standard and finished pieces against realised auction results, returning a fair value with a confidence range.
The 4Cs & certification
Carat, cut, colour, clarity and GIA grading set stone value.
Maker & signature
A named house can multiply value.
Metal & materials
Gold and platinum content set a floor.
Provenance & period
History and era lift exceptional pieces.
Record jewellery sales
| Item | Price | Why |
|---|---|---|
| Important coloured diamond | $50M+ | Rare colours top the jewellery market |
| Signed high-jewellery piece | $100k+ | Major-house signature drives value |
| Branded gold piece | $2k-20k | Signature and condition set the band |
Public auction results, shown to illustrate the value drivers Assay blends into every valuation. Not investment advice.
The trusted number for jewellery.
Instant blended value
Live sold comps, active asks and price guides weighted into one fair value with a confidence range — in seconds.
Sell safely, for less
One-tap, escrow-protected listings at a fraction of ~13% marketplace fees and 20–26% auction premiums.
One vault, everywhere
Track your jewellery beside every other market in one portfolio, synced across Android, iOS and web.
Jewellery valuation FAQ
Loose diamonds against the 4Cs and the blended sold-comp data from eBay and reference databases trade benchmark; finished pieces on maker, materials and provenance, anchored to auction results. Assay blends these into an instant estimate.
Often far more — a signature from a major house can multiply value well beyond the stones and metal alone. Assay factors maker into the estimate.
Rare coloured diamonds have reached tens of millions at auction, driven by colour, size and rarity.
Yes — valuations become escrow-protected listings, with insured, vault-to-vault handling for high-value pieces. We do not enter your sensitive financial details on your behalf.
Free valuations are included daily, with unlimited valuations and tracking on Pro.
Verified data sources
The authoritative pricing references Assay blends and links to for jewellery — so every valuation is traceable.
Independent third-party sources, linked for verification. Trademarks belong to their respective owners; Assay is not affiliated unless stated.
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Know the real worth of what you hold
From graded cards and coins to watches, art and antiques — one valuation standard across every collectible market.
Know what your jewellery is
really worth.
Free to start — on Android, iOS and the web. Value, track and sell in one secure vault.