Jewellery & diamond identifier
Know what it is.
Then what it’s worth.
Photograph any ring, necklace, bracelet or loose stone. Carat identifies the metal and its purity, every stone, and the hallmarks — then values the piece in three markets, grounded in recent sales.
- No account, no email address
- Your collection stays on your phone
- Every figure shows its sources
Sample scan
- Platinum 950
- 1.2 ct round
- VS1 · F
- 18k white gold
- Ceylon sapphires
- Diamond halos
- Platinum
- Old European cuts
- c. 1925
- 18k yellow gold
- 3.1 ct oval ruby
- Baguette halo
AI estimate, not a certified appraisal.
How it works
One photograph. A gemologist’s dossier.
- 1
Photograph the piece
Diffuse daylight, a plain background, the piece filling the frame. Add a close-up of the hallmark inside the band or on the clasp — it is the strongest evidence a photograph can carry.
- 2
Read the dossier
Metal and purity. Every stone: natural, lab-grown or simulant, with 4C estimates for diamonds. Hallmarks transcribed exactly as stamped. A rarity index from Common to Exceptional.
- 3
See the value in three markets
Melt value of the metal, recent resale prices, and retail replacement — each grounded in completed sales that Carat cites. Export a PDF dossier for your insurer or a buyer.
Honesty rules
Estimates, not appraisals — and it says so.
A three-step verdict, never a stamp
Likely genuine, inconclusive, or likely simulant — with the evidence for and against listed, and the test that would settle it. No red “fake” banner on a family ring.
It says when it can’t tell
A simulant and a natural stone can look identical in a photograph. When the evidence is thin, Carat withholds the number instead of guessing one.
Every figure has a source
Values come from recent completed sales and current metal spot prices, and the sources are shown. Remembered prices are never laundered into comparables.
Private by default
Anonymous identity, no email address. The Vault lives on your phone. Photographs are processed to identify the piece and deleted when you delete it.
What it reads
Rings to loose stones, 9 carat to platinum.
Carat was built for the drawer nobody has opened in twenty years: mixed, unmarked, inherited, and occasionally worth more than the box it came in.
Pieces
Rings, necklaces, pendants, bracelets, bangles, earrings, brooches, watches, cufflinks, chains, loose stones and full sets.
Metals
Yellow, white and rose gold from 9 to 24 carat, platinum, palladium, silver, titanium and steel — plus plated, filled and vermeil, which it will tell you apart.
Stones
Diamond, sapphire, ruby, emerald, pearl, opal, jade, amethyst, aquamarine, topaz, tanzanite, garnet and more — natural, lab-grown, treated or simulant.
Marks
Purity marks, assay office marks, date letters, maker’s marks, country marks and brand signatures, transcribed exactly as stamped rather than guessed at.
Plans
One subscription, every feature.
No credits, no per-scan fees, no advertising. Prices shown in US dollars; the App Store charges in your currency.
Annual
$49.99/yrFree trial, then billed yearly. Best value.
Weekly
$5.99/wkBilled weekly, cancel any time.
Lifetime
$79.99Pay once, keep Carat.
Subscriptions renew automatically until cancelled in Settings. Cancel at least 24 hours before a period ends.
Questions
Straight answers
Can an app really tell if a diamond is real from a photo?
Not with certainty, and Carat says so. A photograph shows how a stone handles light, how it is set and how the metal has worn; that is enough to say "likely genuine", "inconclusive" or "likely simulant" with the reasons, and to tell you which test — a thermal probe, a 10x loupe or a laboratory report — would settle it.
What does the value estimate mean?
Three figures, not one: the melt value of the metal, what comparable pieces have recently sold for, and what a retailer would charge to replace it. Each is grounded in completed sales that Carat cites. When there is not enough evidence, it gives no number.
Is the 4C grade a real grade?
No. Carat estimates carat, cut, colour and clarity from the photograph and labels them as estimates. Only a laboratory such as GIA or IGI can grade a stone.
Does Carat read hallmarks?
Yes. A close-up of the inside of a band, the clasp or the post is the strongest evidence a photo can carry. Marks are transcribed exactly as stamped — 750, 585, 925, PT950, maker’s marks and date letters — and then interpreted.
Do I need an account?
No. There is no sign-up and no email. Your identified pieces are kept on your phone in the Vault and are not uploaded unless you choose to share one.
Open the drawer.
The piece you have never looked up is the one worth photographing first.