Mineraloid Like Synthetic Material

Small clear faceted gemstone, possibly cubic zirconia

Unconfirmed; cubic zirconia (ZrO₂) is a possibility, but diamond or another colorless stone cannot be identified from this image alone

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Tumbled amethyst

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

Tumbled amethyst

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

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2

Obsidian

Volcanic Glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), probably rock crystal; exact identification is uncertain from the strongly backlit image

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Black Obsidian

Volcanic Glass (Amorphous SiO2)

Likely silicon carbide (carborundum)

Synthetic silicon carbide (SiC), likely blue-green crystalline grit

Silicon Carbide (Carborundum)

Moissanite (SiC)

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Obsidian

Volcanic Glass (Amorphous SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Obsidian

Volcanic glass (SiO2 + impurities)

Amber

Succinite (Resinite)

Obsidian

Volcanic Glass

Amber

Fossilized Tree Resin (Succinite)

Likely amber cabochon ring

Amber, fossilized tree resin (organic mineraloid; not a mineral)

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Black Obsidian

Volcanic Glass (predominantly SiO2)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Ruby Lavender Quartz with Amethyst

Silicon dioxide with neodymium dopant (SiO2)

Obsidian

Volcanic Glass

Amethyst (faceted gemstone)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

Polished mahogany obsidian

Volcanic glass; predominantly silica-rich rhyolitic composition (SiO₂)

Mahogany Obsidian

Volcanic glass (high silica) with inclusions of Magnetite or Hematite

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Tektite

Tektite (high-silica natural glass)

Amber

Succinates (Organic compound: C10H16O)

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Green glassy gemstone-like specimen

Likely synthetic glass or treated quartz; exact identification requires testing

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Green Opal (Prase Opal)

SiO2 · nH2O (Hydrated Silicon Dioxide)