Synthetic (Man Made Glass)

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

Faceted citrine-colored gemstone

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

Black onyx or black spinel ring stone

Likely chalcedony (SiO₂), variety black onyx; possibly synthetic spinel or glass

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Diamond (or Diamond Simulant)

C (Carbon) or synthetic equivalent

Blue cabochon gemstone, likely blue sapphire

Corundum (Al₂O₃), colored blue by trace iron and titanium

Sapphire

Corundum (Al2O3)

Silicon

Element Si

Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)

Quartz (Silicon Dioxide) with Lepidocrosite or Hematite inclusions (SiO2 + Fe2O3 · nH2O)

Blue gemstone, likely iolite or blue sapphire

Iolite (cordierite, Mg₂Al₄Si₅O₁₈) or corundum (sapphire, Al₂O₃)

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Emerald

Beryl (Be₃Al₂Si₆O₁₈), colored green by chromium and/or vanadium

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Citrine

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Likely milky quartz fragment

Quartz (SiO₂)

Cut gemstone ring, likely diamond

Diamond (carbon, C), faceted gemstone; exact stone identification is uncertain from the image

Moonstone cabochon (probable)

Adularescent feldspar, usually orthoclase–albite intergrowth (KAlSi3O8–NaAlSi3O8)

Obsidian

Volcanic glass

Tumbled orange-and-white feldspar-rich stone, likely sunstone or orange feldspar

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈; exact identification is uncertain from the image

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Green aventurine bead (likely)

Quartz, SiO₂, with green fuchsite inclusions

Black tumbled stone, possibly obsidian

Obsidian (natural volcanic glass; composition varies, typically silica-rich)

Pink tourmaline (rubellite)

Elbaite tourmaline, lithium sodium aluminum borosilicate: Na(Li1.5Al1.5)Al6(BO3)3Si6O18(OH)4

Labradorite cabochon

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Faceted glass-like gemstone (likely synthetic quartz or cubic zirconia)

Identification uncertain; possibilities include synthetic quartz (SiO₂) or cubic zirconia (ZrO₂)

Chert (Flint)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Pink amethyst or pale pink quartz gemstone

Quartz, SiO₂; pink coloration may result from microscopic inclusions or irradiation-related defects

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Clear faceted gemstone, likely quartz (rock crystal)

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

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Native Silver

Silver (elemental Ag)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities and natural radiation

Tumbled amethyst

Amethyst, purple quartz (SiO₂)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)