Is your diamond fairly priced?
Enter a GIA certificate number or upload your certificate for an instant market price check — powered by Rapaport data and AI analysis of 20+ variables.
AI Analysis
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AI Certificate Read
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GIA Cert Lookup
Enter any cert number
Full Report on App
Deep dive with the iOS app
What makes us different
Most diamond websites have a hidden agenda. We don't.
We don't try to sell you diamonds
Unlike most diamond websites, we have no inventory and no incentive to push you toward a purchase.
No affiliate commissions
We don't earn referral fees from dealers or retailers. Our analysis isn't influenced by who's paying us.
100% unbiased pricing
Our only goal is giving you an accurate market price so you can make an informed decision — whether buying or selling.
How it works
Three steps to know your diamond's true market value
Enter your GIA number
Type the certificate number from your GIA report, or upload a photo of the certificate.
AI analyzes 15+ factors
Built on decades of second-generation diamond dealing expertise, our AI cross-references Rapaport pricing, cut quality, inclusions, proportions, and fluorescence — all in seconds.
Get your price check
See if the diamond is priced fairly, what deductions apply, and how it ranks vs. comparables.
How we analyze your diamond
Our AI model is trained on thousands of diamonds inspected in person — combining GIA grading data, clarity plot analysis, and real market pricing.
Clarity Plot Analysis
We read the GIA clarity plot — the diamond diagram showing the exact location and type of every inclusion. Inclusions near the table impact brilliance more than those near the girdle. Our model weighs position, type, and count to calculate the real price impact.
Proportions & Cut Quality
We evaluate depth, table, crown angle, pavilion angle, girdle thickness, and culet size against ideal ranges for each shape. These proportions determine how light travels through the diamond — and directly affect brilliance, fire, and market value.
Recently checked diamonds
Real diamonds analyzed by our users
See a real analysis
Here's what a DiamondCheck AI report looks like — a 2.54ct E/VS2 Marquise with full deduction breakdown, quality checks, and clarity plot analysis.
2.54ct E/VS2 Marquise
GIA #5172430329 · Polish: G · Sym: VG · Fluor: Medium
See it in action
Full analysis on your iPhone — instantly
Tools
Frequently Asked Questions
Common questions about diamond pricing and GIA certificates
Is DiamondCheck AI free to use?›
The website tools — GIA certificate lookup and price calculator — are completely free. The iOS app offers deeper analysis including deduction breakdowns, negotiation advice, and a letter grade.
How accurate is the price estimate?›
Our estimates are based on current wholesale benchmark pricing and industry-standard deduction models. They reflect fair market value, not retail markup. Always verify with a certified gemologist before making a purchase decision.
What is a GIA certificate?›
A GIA Diamond Grading Report is an independent assessment of a diamond's quality issued by the Gemological Institute of America — the world's most trusted grading lab. It documents the 4 Cs (carat, cut, color, clarity) and other characteristics.
What does the letter grade mean?›
Our AI assigns a letter grade (A+ to D) based on the overall quality profile of the diamond — cut quality, proportions, fluorescence, inclusions, and price relative to comparables. A higher grade means better overall value.
Why does diamond resale value differ from what I paid?›
Retail jewelry prices include significant markups (often 100–200%). Resale value reflects the wholesale market price, which is typically 25–50% of retail. Our tool shows you what a diamond is worth at fair market value.
Can I upload a PDF or photo of my certificate?›
Yes — on the GIA Check page you can upload a photo or scan of your certificate. Our AI reads the certificate and extracts the grading data automatically.
Can I use this as a diamond appraisal?›
DiamondCheck AI provides a fair market value estimate based on current Rapaport wholesale pricing — not a formal appraisal. It's a great tool to benchmark any appraisal you receive from a jeweler, verify you're getting a fair price, or understand what your diamond is worth before selling. For insurance purposes, you'll still need a certified appraiser.
How is this different from a jewelry store appraisal?›
Jewelry store appraisals typically reflect the insurance replacement value — often 2–3x higher than what you'd actually receive selling the diamond. Our estimate reflects the real wholesale market value based on Rapaport data, which is closer to what dealers and buyers actually pay.
Get the full report on the app
The iOS app unlocks the complete analysis — deduction breakdown, negotiation advice, letter grade, red flags, and more.
