Synthetic Glass (Man Made)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon dioxide (SiO2)

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Pumice

Pumice (Vitreous volcanic rock)

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Sapphire (Blue)

Corundum (Al2O3)

Cubic Zirconia and Synthetic Ruby Jewelry

Cubic Zirconia (ZrO2) and Synthetic Corundum (Al2O3)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst ring

Amethyst, purple quartz (SiO₂)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Polished labradorite cabochon

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

Emerald

Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Amethyst ring

Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones

Sea Glass

Amorphous Silica (Glass) SiO2

Sapphire

Corundum (Al2O3)

Black onyx or black spinel ring stone

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

Faceted citrine-colored gemstone

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

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (ZrO₂), tentative; possibly diamond or synthetic moissanite

Blue gemstone, likely iolite or blue sapphire

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

Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)

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

Silicon

Element Si

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Native Silver

Silver (elemental Ag)

Blue Sea Glass

Amorphous Silica (Anthropogenic glass)

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

Cut gemstone ring, likely diamond

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

Smoky Quartz

Silicon Dioxide (SiO2)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Diamond (or Diamond Simulant)

C (Carbon) or synthetic equivalent

Moonstone cabochon (probable)

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