Gemstone

Red Jasper

Cryptocrystalline Quartz (SiO2 with Iron oxide inclusions)

Blue Topaz

Aluminum Silicate Fluoride Hydroxide Al2SiO4(F,OH)2

Faceted clear gemstone ring, likely quartz or glass imitation

Unidentified colorless faceted material; quartz (SiO₂) is possible, but the image cannot distinguish it from glass or another gem

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Fluorite Bracelet

Calcium Fluoride (CaF2)

Peridot

Olivine ((Mg, Fe)2SiO4)

Lake Superior Agate

SiO2 (Quartz variety chalcedony)

Peridot

Olivine (Mg, Fe)2SiO4

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

White Topaz

Al2SiO4(F,OH)2

Small gold-colored jewelry piece with clear stones

Likely a metal setting holding small faceted gemstones; the stones cannot be identified from the image.

Aquamarine in Onyx / Blue Topaz Pendant

Beryl (Be₃Al₂Si₆O₁₈) or Topaz (Al₂SiO₄(F,OH)₂)

Faceted Quartz or Cubic Zirconia

SiO2 (Quartz) or ZrO2 (Cubic Zirconia)

Malachite on Quartz

Cu2CO3(OH)2 / SiO2

Blue Obsidian

Volcanic Glass (Silica, SiO2)

Tahitian Pearl (Black / Pistachio Pearl)

Biogenic Aragonite / Calcite (CaCO3 with conchiolin)

Turquoise and Red Coral

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)

Gemstone Tree Brooch (Agate and Quartz)

Silicon Dioxide (SiO2)

Polished Agate (Yellow/Grey Agate Pendant)

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (Quartz variety), SiO2

Emerald

Beryl (Be3Al2(SiO3)6)

Mixed Gemstone Rough

Various silicate and oxide minerals

Black Onyx

Silicon Dioxide (SiO2) - Chalcedony

Faceted clear gemstone in an ornate ring

Likely colorless cubic zirconia (zirconium dioxide, ZrO₂); the image is insufficient to distinguish it from diamond or glass

Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Polished carnelian agate

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Smoky Quartz

Silicon Dioxide (SiO2)

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Peridot

Olivine ((Mg,Fe)2SiO4)

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Diamond-set gold jewelry piece

Diamond, crystalline carbon (C), mounted in gold alloy

Red heart-shaped glass bead in a wire-wrapped jewelry charm

Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen

Turquoise and Red Coral

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)

Citrine

Silicon dioxide (SiO2) - yellow quartz variety

Fairburn Agate / Agate-bearing Breccia

Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix

Dalmatian Stone and Lapis Lazuli

Dalmatian Stone (Felsic Igneous Rock) with Lapis Lazuli

Aquamarine

Beryl (Be3Al2(SiO3)6)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Pearl (Pendant)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

Quartz

Silicon Dioxide (SiO2)