Diamond
Carbon (C), Native Element
mineral
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Synthetic Material) in the encyclopedia
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Silicon
Element Si
mineral
Star ruby cabochon ring
Corundum, Al₂O₃ (ruby variety), displaying asterism
gemstone
Hematite
Iron(III) oxide (Fe2O3)
mineral
Ruby (Faceted)
Corundum (Al2O3 with Cr trace elements)
gemstone
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Diamond-set ring (likely lab-grown or natural diamonds)
Diamond, crystalline carbon (C)
gemstone
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with Druzy/Polished Edge)
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium trace elements)
mineral
Red faceted gemstone ring
Likely synthetic ruby or red spinel; exact identification requires testing
gemstone
Blue chalcedony cabochon (probable)
Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)
gemstone
Tumbled amethyst
Amethyst, purple quartz (SiO₂)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Diamond (Faceted)
Carbon (C)
gemstone
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Dyed Quartz Pendant
Silicon Dioxide (SiO2) with artificial dye
mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Ruby cabochons
Corundum, aluminum oxide (Al₂O₃), colored red by chiefly chromium
gemstone
Blue Sapphire
Corundum (Al2O3)
mineral
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Diamond (or Diamond Simulant)
Native Carbon (C)
gemstone
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Diamond
Pure Carbon (C)
mineral
Clear faceted gemstone, likely quartz (rock crystal)
Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash
gemstone
Cubic Zirconia (Simulated Diamond)
Zirconium Dioxide (ZrO2)
mineral (synthetic)