Man Made Material (Jewelry, Metal Alloy)

Diamond-set gold ring (stone identity uncertain)

Possible diamond (crystalline carbon, C); metal setting appears gold-colored

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Diamond-set gold ring

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

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Not a geological specimen

N/A (man-made object)

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Opalite

Synthetic Glass (Silica-based)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Opalite

Synthetic Opalized Glass / Man-made Glass

Opalite

Synthetic Glass / Man-made Opal Simulant

Opalite

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

Blue Goldstone

Aventurine Glass

Goldstone

Man-made glass infused with copper particles

Opalite

Synthetic Opalite Glass / Opalized Glass

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Slag

Metallurgical by-product

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Blue Goldstone

Man-made glass with cobalt and metal flecks

Aluminum Slag

Anthropogenic Aluminum (Al)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Gem-set gold ring

Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image

Aluminum Slag

Anthropogenic Aluminum (Al)

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Opalite

Man-made Opalized Glass (Synthetic Glass)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Diamond-set gold ring or ring component

Diamond (crystalline carbon, C); gold alloy setting (Au)

Goldstone

Man-made glass infused with copper crystals

Opalite

Synthetic glass / Opalized glass

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Opalite

Man-made opalized glass

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Opalite

Synthetic Glass (Simulated Opal)

Opalite

Synthetic Glass (SiO2 + impurities)