Mineral (Synthetic)

White Sapphire

Corundum (Al2O3)

Staurolite (Cross Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Pink corundum (likely synthetic or treated sapphire)

Corundum, Al₂O₃; pink coloration commonly from chromium or treatment

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions

Dyed Blue Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond

Faceted citrine-colored gemstone

Likely citrine (quartz, SiO₂); possibly yellow glass or synthetic gem

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Emerald

Beryl (Be3Al2(SiO3)6)

Peridot gemstone pendant

Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Smoky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Ruby

Corundum (Al2O3) with Chromium traces

Rough Corundum (likely Sapphire or Common Corundum)

Aluminum oxide (Al2O3)

Smoky Quartz

Silicon Dioxide (SiO2)

Red Agate (Carnelian)

Silicon Dioxide (SiO2)

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Blue faceted gemstone, likely synthetic sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively magnesium aluminate spinel (MgAl₂O₄)

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

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

Gemstone stud earrings, likely set with clear stones

The stones may be diamond (carbon, C) or colorless cubic zirconia (ZrO₂); the image is insufficient to distinguish them.

Cubic Zirconia (Set in Jewelry)

Zirconium Dioxide (ZrO2)

Ruby

Corundum (Al2O3)

Blue resin-coated or dyed stone cabochon

Likely dyed chalcedony/agate (microcrystalline quartz, SiO₂); exact material is uncertain from the image

Black spinel bead bracelet

Spinel (magnesium aluminate), MgAl₂O₄

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Ruby (Faceted)

Corundum (Al2O3:Cr)

Opal ring (likely precious opal)

Hydrated amorphous silica, SiO₂·nH₂O; the pictured stone may be natural opal or a lab-created/imitation opal

Opal gemstone pendant

Opal (hydrated amorphous silica, SiO₂·nH₂O)

Iridescent coated quartz (likely synthetic/display gemstone)

Quartz, silicon dioxide (SiO₂), likely faceted and surface-coated; exact material cannot be confirmed visually

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Opal ring

Precious opal, hydrated amorphous silica (SiO₂·nH₂O), set in a metal ring

Polished pink corundum (likely treated ruby)

Corundum, aluminum oxide (Al₂O₃); ruby when red-to-pink from chromium

Blue gemstone, likely tumbled sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively spinel (MgAl₂O₄)

Ruby (varietal of Corundum)

Corundum (Al2O3:Cr)

Coal (Bituminous or Anthracite)

Carbonaceous Sedimentary Rock

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Pink/red faceted gemstone, likely synthetic corundum or glass imitation

Corundum (Al₂O₃), ruby/sapphire variety; exact identification requires testing

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Smoky Quartz

Silicon Dioxide (SiO2)

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline