Gemstone Identifier: Free Photo Identification
Upload or take a photo of any raw, cut, or faceted gem to discover what gemstone is this and learn how to check authenticity.
Drop your rock photo here to identify for free
Snap or upload any rock, crystal, mineral, or stone. Our AI analyzes texture, color, and cleavage instantly.
What Gemstone Is This? Instant Photo Gemstone Identification
A gemstone is a mineral crystal, rock, or organic material that is cut, polished, or collected for its extraordinary beauty, rarity, and durability. When asking what gemstone is this, our AI gemstone identifier evaluates color saturation, pleochroism clues, facet reflections, luster, and transparency. Whether you inherited loose vintage stones, found rough beryl in pegmatite gravels, or bought a mysterious cabochon, our AI provides instant species classification.
What Kind of Gemstone Is This? Precious vs. Semi-Precious
To understand what kind of gemstone is this, gemologists traditionally distinguish the four cardinal precious gemstones—Diamond (carbon), Ruby (red corundum), Sapphire (blue corundum), and Emerald (green beryl)—from semi-precious gems including Garnet, Topaz, Spinel, Tourmaline, Tanzanite, Peridot, Opal, and Zircon. Evaluating crystal hardness and refractive brilliance separates high-value gems from ordinary rock minerals.
How to Tell If a Gemstone Is Real (Vs. Synthetic, Glass or Cubic Zirconia)
Thermal Conductivity (Ice Melt Test)
Genuine gemstones conduct heat rapidly. If placed against ice, a real diamond, sapphire, or ruby melts ice almost instantly compared to glass or plastic.
Natural Inclusions (Jardin) Check
Inspect under 10x to 30x magnification. Real natural gems contain microscopic silk needles, feather fissures, or two-phase fluid pockets. Synthetic glass has round air bubbles or concave molded facets.
Mohs Scratch Resistance
Precious gemstones are remarkably hard: Corundum (ruby/sapphire) is Mohs 9, chrysoberyl is 8.5, topaz and emerald are 7.5 to 8. They will easily scratch quartz and glass without sustaining surface damage.
Sharpness of Facet Junctions
On faceted gemstones, inspect the junction lines where facets meet. Genuine cut gems feature razor-sharp crisp edges. Molded glass or resin imitations feature rounded, soft facet edges.
Common Gemstone Specimens
| Specimen Name | Category | Key Identification Trait |
|---|---|---|
| Raw Emerald | Beryl (Cyclosilicate) | Hexagonal prism, vivid green with characteristic internal jardin inclusions; Mohs 7.5-8. |
| Sapphire / Ruby | Corundum (Al₂O₃) | Extremely hard (Mohs 9); hexagonal barrel shapes; vitreous to adamantine luster. |
| Precious Opal | Hydrated Silica | Iridescent play-of-color flashes (red, green, violet) shifting under directional light. |
| Spessartine Garnet | Nesosilicate | Vivid fiery orange-red dodecahedral crystals; isotropic optical behavior; Mohs 7-7.5. |