Synthetic Or Natural Fiber

Diamond (or high-quality simulant like Cubic Zirconia)

Carbon (C) - Native Element

Faceted pale-green gemstone, likely prasiolite or green quartz

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

Diamond (or Diamond Simulant)

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

Dyed Agate Geode

Silicon Dioxide (SiO2) with artificial pigment

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

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 synthetic simulant)

Cubic C (Carbon)

Hematite

Iron(III) oxide (Fe2O3)

Diamond (or Diamond Simulant)

Carbon (C)

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

Lapidary Wax (imitation/wax model)

Hydrocarbon wax blend with colorant (imitating Lapis Lazuli/Emerald)

Blue faceted gemstones, likely blue sapphire

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

Cubic Zirconia (Faceted)

Zirconium Dioxide (ZrO2)

Ametrine

Silicon Dioxide (SiO2) with iron impurities

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Synthetic Sapphire and Ion-X Glass

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

Diamond (or Clear Quartz / Cubic Zirconia)

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

Red faceted gemstone jewelry setting

Likely synthetic ruby or red spinel centerpiece with colorless accent stones; exact identification requires gemological testing

Blue sapphire ring

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

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)

Hematite cameo or hematine imitation

Hematite (Fe₂O₃); possibly synthetic hematine or black glass

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Green faceted gemstone, likely emerald

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

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Dyed Alum or Dyed Quartz (Ornamental Crystal)

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

Cubic Zirconia (Faceted Gemstone)

Zirconium dioxide (ZrO2)

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Ruby / Red Corundum

Al2O3 (Aluminum Oxide with Chromium trace)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Green cabochon gemstone pendant, likely turquoise or dyed green turquoise

Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing

Colorless faceted gemstone (likely cubic zirconia)

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

Ruby

Corundum (Al2O3 with Chromium)

Polished blue-black cabochon, likely blue obsidian or dyed glass-like stone

Indeterminate from image; possible natural obsidian (volcanic glass), commonly SiO₂-rich rhyolitic glass