Free · No appraisal fee · Estimate only
Diamond Value Calculator.
Enter the details from your GIA report. If you don't have a report, guess — confidence drops but the estimate is still useful as a floor.
What buying the same diamond at retail would cost today
Selling direct to a buyer (Craigslist, WP Diamonds, IDoNowIDont, etc.)
What a local jeweler will offer cash
What a pawn shop will offer (fast cash, lowest)
- ·Diamonds set in older rings are valued by the stone, not the setting. Setting metal (gold/platinum) has additional scrap value.
Estimate only — not an appraisal. These figures are heuristic ranges based on public retail pricing patterns. Real offers vary by stone-specific factors (fluorescence, certificate looseness, market timing). For a binding price, request a written GIA report and shop at least three jewelers.
How the estimate is built
Enter the four grades from your report plus the stone's origin, and the calculator returns four bands rather than one number, because a diamond has no single price. The retail band is what a comparable certified stone lists for today. Private resale is what a verified buyer — a jeweler partner, a second-hand specialist, or a matched private buyer — will pay. The jeweler buy-back band is the offer you should expect across a counter, and the pawn band is the floor, anchored to metal value and a quick flip.
Underneath, the bands come from Rapaport-style price-list heuristics: a grid of per-carat prices indexed by colour and clarity that steps up at weight thresholds, adjusted for shape and for origin. Lab-grown input is priced against the current lab market rather than against retail, which is why that number lands so much lower than the stone's original sticker.
What the estimate does not know
It has not seen your stone. Cut grade and proportions, fluorescence, the condition of the girdle and facets, which laboratory issued the report, and whether the paper is original or a reprint all move the real offer, and none of them are inputs here. A GIA report typically raises an offer; a stone presented without paper is priced with a discount because the buyer is taking the grading risk.
The setting is not valued either, beyond whatever the metal is worth as weight. A signed or period mounting can add a great deal to a sale and a plain solitaire adds almost nothing, so a ring is worth more than a loose stone of the same specifications only when the maker or the period supports it.
Treat the retail band as a reference point, not as a target. The gap between retail and what a dealer pays is the margin, the risk buffer and the time the money is tied up — it exists on every stone, and no estimate removes it.
Frequently asked questions
How accurate is the diamond value calculator?
It returns four price bands — retail, private resale, jeweler buy-back, and pawn — based on Rapaport-style price-list heuristics weighted by the 4 Cs you input. It is an estimate, not an appraisal. Confidence is highest with a GIA report; lower if you guess the grades.
What price will a jeweler actually offer me?
Most jewelers offer 20–40% of retail. They need margin to resell, plus risk-buffer for cert lookups and re-cutting. Use the “Jeweler offer” band as your floor.
How is private resale value calculated?
Private resale captures what a verified buyer (jeweler partner, second-hand specialist, or matched private buyer) will pay. Typically 50–65% of retail.
Do lab-grown diamonds have resale value?
Lab-grown diamond resale is brutal — typically 10–20% of original purchase. Wholesale lab prices have fallen 70%+ since 2020 as production scaled, so used-market premium has collapsed.
The fastest way to move from an estimate to a number is to take the stone to two dealers for written offers. The spread between the first and second offer is usually larger than any difference the grades would explain, and collecting them costs nothing.