Mineraloid (Synthetic)

Obsidian

Volcanic Glass (Amorphous SiO2)

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo

Star sapphire ring

Corundum (Al₂O₃), likely asteriated sapphire

Diamond (or Cubic Zirconia)

Cubic Carbon (C) or Zirconium Dioxide (ZrO2)

Obsidian

Volcanic Glass

Limonite or Ironstone Nodule

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Black Obsidian

Volcanic Glass (predominantly SiO2)

Cut purple gemstone, likely synthetic cubic zirconia or glass

Undetermined; possible cubic zirconia (ZrO₂)

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

Corundum, Al₂O₃; red color is typically caused by chromium

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), red variety colored mainly by chromium

Diamond-set gold ring

Diamond (carbon, C) in a gold-alloy setting; the stone may be a diamond or a diamond simulant

Opalite

Synthetic Opalized Glass

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Opalised Glass

Opalite (Man-made Glass)

Synthetic Opalised Glass

Blue Obsidian

Volcanic Glass (Amorphous)

Obsidian

Volcanic Glass

Black Obsidian

Volcanic Glass (Amorphous SiO2)

Black Obsidian

Volcanic Glass (Amorphous SiO2 with trace impurities)

Red gemstone ring (likely synthetic ruby or red glass)

Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image

Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia)

Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)

Obsidian

Volcanic Glass (Amorphous silicon dioxide with impurities)

Black Obsidian

Volcanic glass

Obsidian

Volcanic Glass

Obsidian

Volcanic Glass (SiO2 + impurities)

Fulgurite

Fulgurite (Lechatelierite)

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Faceted Quartz or Cubic Zirconia

SiO2 (Quartz) or ZrO2 (Cubic Zirconia)

Mood Ring Stone

Liquid crystal thermotropic polymer

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby when red, possibly laboratory-grown

Opalite

Synthetic glass (SiO2 + impurities)

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium

Gemstone ring (stones not identifiable from image)

Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants

Rock Crystal (Clear Quartz)

Silicon dioxide (SiO2)

Diamond-set gold ring

Diamond (crystalline carbon, C) set in a gold alloy; the metal and setting are manufactured

Green faceted or cabochon gemstone (possibly glass or synthetic)

Undetermined; possibilities include green beryl (Be₃Al₂Si₆O₁₈), quartz (SiO₂), or synthetic glass

Gemstone rings (stones not reliably identifiable)

The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.

Obsidian

Volcanic Glass

Tumbled black stone, likely black obsidian

Obsidian — volcanic glass, primarily SiO₂