Diamond Price Calculator
Our free diamond price calculator estimates your diamond's fair market value from its 4Cs — shape, carat, color, and clarity — using current Rapaport wholesale pricing.
How the diamond price calculator works
The calculator starts from the current Rapaport list price for your diamond's shape, carat weight, color, and clarity — the same wholesale benchmark professional dealers price against. It then applies industry-standard adjustments for cut quality, polish, symmetry, fluorescence, and proportions to land on a realistic fair-market estimate. You get a number in seconds, with no account and no personal details required.
What the calculator factors in
- The 4Cs — shape, carat weight, color, and clarity set the Rapaport base price.
- Cut, polish & symmetry — how well the stone is finished, which can swing value significantly.
- Fluorescence — can slightly raise or lower price depending on grade.
- Proportions — table and depth percentages that affect how the diamond handles light.
How accurate is the estimate?
The diamond price calculator gives a wholesale-benchmark estimate — a strong reference point for judging whether a retail price is fair, but not a formal appraisal. For an exact figure tied to a specific stone, use the GIA certificate check to pull verified specs by report number, or read how much your diamond is worth for the full valuation walkthrough.
Frequently Asked Questions
Is the diamond price calculator free?›
Yes — the calculator is completely free. Enter your diamond's specs and get an instant estimated fair market value based on current Rapaport wholesale pricing.
What specs do I need to use the calculator?›
At minimum you need shape, carat weight, color, and clarity. For a more accurate estimate, also enter cut grade, polish, symmetry, and fluorescence. Depth and table percentages are optional but improve accuracy.
How is the price calculated?›
We start with the current Rapaport list price for your diamond's shape, carat weight, color, and clarity. Then our AI applies industry-standard deductions for cut quality, polish, symmetry, fluorescence, and proportions — the same methodology used by professional diamond dealers.
What's the difference between this and the GIA Certificate Check?›
The GIA Certificate Check looks up a specific diamond by its GIA report number and pulls the exact specs from GIA's database. The calculator lets you enter specs manually — useful if you don't have a GIA number or want to compare hypothetical diamonds.
Does this work for lab-grown diamonds?›
The calculator uses Rapaport benchmark pricing, which only covers natural diamonds. Lab-grown diamond pricing doesn't have a standardized benchmark, so estimates wouldn't be reliable.