Synthetic Or Natural Fiber

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Blue faceted gemstones, likely blue sapphire

Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium

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

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

Black spinel bead bracelet

Spinel (magnesium aluminate), MgAl₂O₄

Diamond (Cut Gemstone)

Carbon (C)

Dyed Agate Geode

Silicon Dioxide (SiO2) with artificial pigment

Colorless faceted gemstone (likely cubic zirconia)

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

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Tiger’s-eye pendant

Chatoyant quartz, primarily fibrous quartz pseudomorph after crocidolite; SiO₂

Blue sapphire

Corundum, aluminum oxide (Al₂O₃), colored blue mainly by iron and titanium

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Polished tiger iron

Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

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

Blue sapphire ring

Corundum (aluminum oxide, Al₂O₃), likely heat-treated sapphire

Tumbled amethyst

Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Amethyst stud earrings

Amethyst, purple quartz (SiO₂)

Opalite

Synthetic Glass / Man-made Opal Simulant

Opal stud earrings

Opal, hydrated amorphous silica (SiO₂·nH₂O)

Green glassy cabochon, likely dyed or synthetic material

Uncertain; possibly green obsidian, chrysoprase, or synthetic glass

Green faceted gemstone, likely emerald

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

Colorless faceted gemstone, likely cubic zirconia

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

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]

Faceted golden beryl (likely heliodor)

Beryl, Be₃Al₂Si₆O₁₈; yellow color from iron impurities

Amethyst (faceted gemstone)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

Cubic Zirconia (Faceted)

Zirconium Dioxide (ZrO2)

Faceted pale-green gemstone, likely prasiolite or green quartz

Quartz (SiO₂), likely prasiolite; identification is uncertain from the photograph

Ruby / Red Corundum

Al2O3 (Aluminum Oxide with Chromium trace)

Blue topaz-style pendant (stone identity uncertain)

Possibly blue topaz (Al₂SiO₄(F,OH)₂); the image cannot confirm whether the stone is natural or synthetic

Hematite bead bracelet

Hematite (iron(III) oxide, Fe₂O₃), likely polished magnetic hematite or hematite-coated beads

Small faceted gemstone, likely diamond

Diamond (crystalline carbon, C)

Diamond (or Clear Quartz / Cubic Zirconia)

Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Colorless faceted gemstone, likely cubic zirconia

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

Cubic Zirconia (Faceted Gemstone)

Zirconium dioxide (ZrO2)

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)

Ametrine

Silicon Dioxide (SiO2) with iron impurities

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass