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Diamond Price Calculator

Estimate what a diamond is worth from its 4Cs. Choose the carat, cut, colour, clarity and shape to get an instant retail and resale value range — for natural or lab-grown stones.

Diamond details

Diamond type
ct

Estimated value

$6,000

≈ $6,000 per carat

Typical retail range

$5,100 – $6,900

What you'd expect to pay in a jewellery store.

Resale / trade-in range

$1,500 – $2,700

What a buyer or dealer is likely to offer secondhand.

Estimate only — actual value depends on certification (GIA/IGI), fluorescence, exact proportions and the current market. For insurance or sale, get a professional appraisal.

How to value a diamond with the 4Cs

Every diamond is graded on four characteristics — known as the 4Cs — and together they determine its market value. Our calculator turns those grades into a dollar estimate so you can check whether a price tag, insurance valuation or buy-back offer is fair.

Carat

The diamond’s weight. Price per carat rises sharply at each size bracket because larger stones are far rarer.

Cut

How well the diamond is proportioned and polished. A great cut returns more light and looks bigger and brighter.

Colour

Graded D (colourless) to Z. The less colour in a white diamond, the higher the value.

Clarity

The fewer inclusions and blemishes, the rarer and more valuable the stone.

Want to know which diamonds are tied to a birth month? Diamond is April's birthstone, and you can explore every month on our birthstone chart. Buying an engagement ring? See our jewellery guide.

Frequently Asked Questions

How is a diamond’s value calculated?
Diamond value is driven by the 4Cs — carat weight, cut, colour and clarity — plus shape and whether the stone is natural or lab-grown. Our calculator anchors a mid-market price per carat for a reference stone and applies relative multipliers for each grade, then scales it by the carat weight to produce an estimated value range.
Is this the same as a professional diamond appraisal?
No. This is a fast estimate to help you sanity-check a quote, an insurance figure, or a resale offer. A formal appraisal accounts for the exact certificate (GIA, IGI), fluorescence, measurements, polish and symmetry, and the current spot market. Always get a certified appraisal before insuring or selling.
Why is the resale value so much lower than retail?
Retail prices include a jeweller’s markup, marketing and overhead. On the secondhand market a dealer needs room to resell at a profit, so trade-in or resale offers are typically 25–45% of retail for natural diamonds — and considerably less for lab-grown stones, whose wholesale prices have fallen sharply.
How much less is a lab-grown diamond worth?
Lab-grown diamonds are chemically identical to natural ones but cost a fraction to produce, and their wholesale prices have dropped dramatically in recent years. We estimate them at roughly 20% of an equivalent natural diamond, with much weaker resale value, because the market remains volatile.
Which of the 4Cs affects price the most?
Carat weight has the biggest impact because large diamonds are exponentially rarer — price per carat jumps at each size bracket. After that, colour and clarity matter most, while cut grade most affects how brilliant the stone looks. The sweet spot for value is often a well-cut stone just under a round size (e.g. 0.90ct rather than 1.00ct).