Synthetic (Glass)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Blue Sapphire (likely lab-grown or treated)

Corundum (Aluminum Oxide, Al2O3)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Faceted pale-green gemstone, likely prasiolite or green quartz

Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone

Man-made glass with cobalt and metal flecks

Blue Sapphire

Corundum (Al2O3)

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Ruby (Faceted)

Corundum (Al2O3:Cr)

Faceted Diamond or Cubic Zirconia

Carbon (C) for Diamond; Zirconium dioxide (ZrO2) for CZ

Opalite

Man-made opalized glass

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Blue Goldstone

Aventurine Glass

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Diamond (or Cubic Zirconia)

Cubic Carbon (C) or Zirconium Dioxide (ZrO2)

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Amethyst cabochon

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Diamond (or Clear Quartz / Cubic Zirconia)

Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Red faceted gemstone jewelry setting

Likely synthetic ruby or red spinel centerpiece with colorless accent stones; exact identification requires gemological testing

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Red synthetic corundum (ruby-colored lab-grown sapphire)

Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored

Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia)

Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)

Silicon

Crystalline Silicon (Si)

Tumbled Clear Quartz and Citrine Points

Silicon Dioxide (SiO2)

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with Fe3+ impurities

Faceted Quartz or Cubic Zirconia

SiO2 (Quartz) or ZrO2 (Cubic Zirconia)

Blue Sapphire

Corundum (Al2O3)

Tumbled amethyst

Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Opalite

Man-made Glass (SiO2 + additives)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive