Synthetic Glass (Man Made)

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Green Aventurine

Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)

Yellow-orange faceted gemstone, likely citrine or yellow topaz

Citrine: quartz, SiO₂; yellow topaz: Al₂SiO₄(F,OH)₂

Amber (Simulated/Faturan Style)

Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)

Red agate bead (likely dyed or treated)

Agate, a microcrystalline variety of quartz; SiO₂

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Obsidian

Volcanic glass (SiO2)

Yellow Sapphire

Corundum (Al2O3:Fe)

Tumbled amethyst

Amethyst, purple quartz (SiO₂)

Rose Quartz

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

Rough Sapphire (Corundum)

Corundum (Al2O3)

Champagne topaz (likely)

Topaz, Al₂SiO₄(F,OH)₂

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Green obsidian (likely moldavite)

Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)

Black spinel bead strand

Spinel, magnesium aluminum oxide (MgAl₂O₄)

Diamond

Carbon (C)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

Obsidian

Volcanic Glass (SiO2)

Blue Sapphire

Corundum (Al2O3)

Chert

Chert (Microcrystalline Quartz)

Tanzanite earrings

Tanzanite, blue-violet zoisite (Ca₂Al₃(SiO₄)₃(OH))

White seed-bead gemstone strand, likely freshwater pearl or shell pearl

Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image

Plastic Building Toy (Lego-style piece)

Acrylonitrile Butadiene Styrene (ABS)

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Smoky Quartz

Silicon Dioxide (SiO2)

Chert or Jasper

Microcrystalline Quartz (SiO2)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; natural versus synthetic cannot be determined from the photo

Flint

SiO2 (Cryptocrystalline Quartz)

Blue cabochon gemstone ring

Likely blue turquoise, glass-filled sapphire, or blue spinel; exact identification requires testing

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material