Cubic Zirconia (Faceted Gemstone)
Zirconium dioxide (ZrO2)
gemstone
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Learn about Synthetic Glass in the encyclopedia
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Opal stud earrings
Opal, hydrated amorphous silica (SiO₂·nH₂O)
gemstone
Orange Sapphire
Corundum (Al2O3)
gemstone
Ametrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Hematite
Hematite (Fe₂O₃), likely a polished specular hematite palm stone
mineral
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Diamond (in jewelry)
Cubic Carbon (C)
mineral
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
gemstone
Blue Sapphire
Corundum (Al2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Assorted Semi-Precious Gemstone Crosses
Quartz, Silicates, Carbonates (various)
mineral
Rainbow carborundum (silicon carbide)
Silicon carbide, SiC; commonly synthetic moissanite/carborundum specimen
mineral
Staurolite (Fairy Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Malachite
Cu2CO3(OH)2 (Copper Hydroxide Carbonate)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Blue Agate Geode (Dyed)
Cryptocrystalline Quartz (SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Diamond
Diamond (C)
gemstone
Turquoise cabochon pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Tumbled turquoise cabochon
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Polished ruby cabochon (likely synthetic or treated)
Corundum, aluminum oxide (Al₂O₃), colored red by chromium
gemstone
Blue-green turquoise (probable)
Turquoise, hydrous copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Blue quartz (likely dyed or synthetic-treated quartz beads)
Quartz, silicon dioxide (SiO₂)
mineral
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Diamond ring (likely diamond with gold band)
Diamond, crystalline carbon (C); band appears gold alloy
gemstone
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Ruby (in jewelry)
Corundum (Al2O3 with Chromium traces)
mineral
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue-green gemstone ring, likely treated turquoise or synthetic/treated beryl
Indeterminate from image; possibilities include turquoise (CuAl6(PO4)4(OH)8·4H2O), apatite, or treated beryl
gemstone
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological