Synthetic Or Natural Fiber

Blue Sapphire

Corundum (Al2O3 with Cr, Fe, and Ti trace elements)

Diamond

Diamond (C)

Silicon Carbide (Carborundum)

Moissanite (SiC), though mostly synthetic

Blue Goldstone

Aventurine Glass

Basalt

Basalt

Pink Tiger's Eye

Silicified Riebeckite Asbestos (SiO2)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Unidentified polished dark gemstone cabochon

Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial dyes

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Pink faceted gemstone, likely synthetic or treated quartz

Quartz, silicon dioxide (SiO₂); exact identity cannot be confirmed from the image

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Diamond (Faceted Colorless)

Diamond (Pure Carbon, C)

Red faceted gemstone, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; visual identification alone is insufficient

Red faceted gemstone ring

Likely synthetic ruby or red spinel; exact identification requires testing

Blue Sapphire (likely lab-grown or treated)

Corundum (Aluminum Oxide, Al2O3)

Cubic Zirconia (as a jewelry specimen)

Zirconium dioxide (ZrO2)

Diamond (or Cubic Zirconia simulant)

Carbon (C) / Zirconium Dioxide (ZrO2)

Diamond

Pure Carbon (C)

Red Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Red cabochon ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), possibly chromium-bearing ruby; the image cannot establish whether it is natural or synthetic

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Blue sapphire ring

Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium

Opalite

Man-made opalized glass

Faceted Diamond or Cubic Zirconia

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

Opalite

Synthetic Opalised Glass

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Red gemstone ring, likely synthetic ruby

Corundum (Al₂O₃), chromium-bearing; possibly lab-created ruby or red glass imitation

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Pink-red faceted gemstone, possibly synthetic corundum or spinel

Uncertain; possible ruby (corundum, Al₂O₃) or red spinel (MgAl₂O₄)

Faceted color-change gemstone, likely synthetic alexandrite or glass imitation

Alexandrite: chrysoberyl, BeAl₂O₄; exact identification requires gemological testing

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Blue cabochon ring stone, likely sapphire or synthetic blue corundum

Corundum (Al₂O₃), possibly chromium/iron-titanium-bearing sapphire

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Dyed Quartz Pendant

Silicon Dioxide (SiO2) with artificial dye

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium