Diamond Identifier. Check if a Diamond Is Real from a Photo
Upload a photo of a diamond, suspected diamond, or unknown clear stone. The AI analyzes brilliance, facet pattern, dispersion, and inclusion visibility to determine whether it is likely a natural diamond, lab-grown diamond, or simulant like cubic zirconia or moissanite. Free visual screening, no account needed.
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Analyzing your diamond…
How the Diamond Identifier Works
Photograph the Stone
Place the diamond on a white or neutral surface under bright, diffused light. Capture the top-down view with the table facet facing up so the AI can read the brilliance and facet pattern clearly.
AI Analyzes Visual Properties
The model examines brilliance intensity, dispersion pattern (fire), facet symmetry, visible inclusions, and edge sharpness. It compares these signals against profiles for diamond, moissanite, cubic zirconia, white sapphire, and glass.
Get the Screening Result
You receive a likely identification, estimated clarity tier, cut quality assessment, approximate carat range, and notes on what further testing would confirm the result. One screen, plain language.
What Is a Diamond Identifier?
A diamond identifier examines the optical behavior of a stone in a photograph and estimates what it is. Rock Identifier on the App Store and this web tool both use the same AI model.
How AI Reads Diamonds
The model measures how light interacts with facets, looking for the crisp high-contrast pattern of bright and dark zones that defines diamond brilliance. It also reads spectral dispersion, the rainbow flashes called fire. CZ produces broader, softer returns. Moissanite throws a more colorful, disco-ball pattern. White sapphire looks flat by comparison. These optical signatures are distinct enough for a trained model to separate in most well-lit photos.
Raw vs Cut Diamonds
Uncut diamonds look nothing like the faceted stones in jewelry. They are typically octahedral, translucent, and show a greasy or adamantine luster instead of sparkle. The surface often carries trigons, tiny triangular etch marks that are a distinctive natural feature. Many minerals get mistaken for rough diamonds, especially quartz, topaz, and zircon. If you found something in alluvial gravel, photograph it dry and from multiple angles for the best AI result.
The 4 Cs
Cut controls how well facets return light. Color grades run from D (colorless) to Z (light yellow). Clarity measures inclusions under 10x magnification, from FL to I3. Carat is weight, with one carat equaling 200 milligrams. No single C dominates value. A large stone with a poor cut can be worth less than a smaller one with Excellent proportions. The AI estimates apparent quality tier from a photo, but a formal GIA or AGS report is needed for precise grades.
Lab-Grown vs Natural
Lab-grown diamonds are chemically, optically, and physically identical to natural ones. HPHT presses replicate mantle conditions in a chamber, growing a diamond in days. CVD deposits carbon atom by atom from a methane gas onto a seed wafer. Both produce real diamond that grades the same on the 4 Cs. The only differences are trace impurities and growth patterns detectable with laboratory spectroscopy. No photo-based tool can tell them apart.
Common Diamond Simulants
Cubic zirconia is zirconium dioxide, Mohs 8.5, about 1.7 times heavier than diamond at the same size. It tends to look "too perfect" because it is manufactured inclusion-free. Moissanite (silicon carbide, Mohs 9.25) is the closest visual match. Under magnification it shows doubled facet edges from birefringence, which diamond never does. White sapphire is Mohs 9 but lacks fire entirely. Glass shows rounded edges, gas bubbles, and swirl marks that the AI detects in close-up shots.
Photographing Diamonds
Bright, diffused light is essential. Direct sunlight creates harsh reflections that obscure facet detail. A cloudy day or a window with sheer curtains works well. Place the stone table-up on a white background, fill the frame, and hold steady. Avoid flash. The AI needs to see the brilliance pattern, fire, and facet edges clearly, so a sharp, well-lit image outperforms a blurry close-up every time. Use macro mode on your phone if available.
Diamond Value Factors
Price per carat jumps at round-number thresholds. A 1.00 ct diamond costs meaningfully more per carat than a 0.95 ct stone of the same quality. Fluorescence can raise or lower value depending on strength and body color. Market conditions, grading lab reputation, and the presence of a laser-inscribed report number on the girdle all affect resale. The AI gives a rough quality bracket, but a professional appraisal is required before selling or insuring any diamond.
Limitations
A photo cannot measure thermal conductivity, which is the standard bench test separating diamond from most simulants. It cannot measure electrical conductivity, which is the only reliable way to distinguish moissanite. It carries no weight data, so specific gravity is off the table. Visual AI is a screening tool that narrows possibilities and flags obvious simulants. It is not a gemological certificate. For definitive answers, visit a credentialed gemologist.
Best Way to Identify Diamonds from a Photo
The most practical way to screen a diamond from a photo is by using an AI diamond identifier. These tools analyze brilliance, fire, cut geometry, and surface characteristics to suggest whether a stone is likely diamond, moissanite, cubic zirconia, or glass. Tools like Rock Identifier provide a useful first pass before professional testing.
When to Use a Diamond Identifier
Diamond identifiers are typically used when you inherit a stone, find a loose gem, or want a quick check before paying for a professional appraisal. They are helpful as a screening tool but cannot replace thermal conductivity testers or gemological instruments.
AI diamond identification can distinguish obvious fakes from potential diamonds, but professional testing is essential for high-value decisions.
Most diamond misidentifications involve cubic zirconia and moissanite, which have different fire patterns visible under magnification.
A real diamond scratches glass easily, but so does moissanite, so a scratch test alone does not confirm diamond.
Photographing the stone against a dark background with a single light source helps AI detect fire and brilliance patterns.
Compared to the fog test or newspaper test, an AI diamond identifier uses more visual signals but still cannot replace a thermal conductivity probe.
Common mistake: The most common diamond identification mistake is assuming a stone is real because it scratches glass. Moissanite and white sapphire also scratch glass.
Frequently Asked Questions
How do I tell if a diamond is real?
Real diamonds show high brilliance, sharp facet edges, and spectral fire. Upload a photo for AI screening, then confirm with a gemologist's thermal probe for a definitive answer.
Can AI identify lab-grown diamonds?
No. Lab-grown diamonds are optically and chemically identical to natural ones. Only specialized spectroscopic equipment can detect the difference.
What is the difference between diamond and cubic zirconia?
Diamond is carbon at Mohs 10. CZ is zirconium dioxide at Mohs 8.5, weighs 1.7 times more at the same size, and typically has zero inclusions, which is itself a tell.
What is the difference between diamond and moissanite?
Moissanite is silicon carbide at Mohs 9.25. It shows doubled facet edges under magnification due to birefringence, which diamond never does. An electrical conductivity tester is needed to separate them.
How much is my diamond worth?
Value depends on the 4 Cs, fluorescence, and market conditions. A photo AI can estimate a quality tier, but get a GIA, AGS, or IGI grading report before selling or insuring.
Can I identify a raw diamond from a photo?
The AI can flag likely rough diamond candidates by shape and luster. Confirmation requires a scratch test and specific gravity measurement because quartz and topaz look similar uncut.
Is there a free diamond identifier app?
Yes. Rock Identifier includes diamond screening and is free on iOS and Android. The web tool offers one free scan per day.
What does diamond clarity mean?
Clarity grades how visible inclusions are under 10x magnification, from FL (flawless) to I3 (obvious to the naked eye). Most jewelry diamonds fall in the SI1 to VS2 range.
