Synthetic (Not A Natural Rock)

Diamond (Baguette cut)

Carbon (C)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with Fe3+ impurities

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Smoky Quartz

Silicon Dioxide (SiO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

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

Diamond (Cut Gemstone)

Carbon (C)

Blue Sapphire

Corundum (Al2O3)

Opalite

Synthetic glass (SiO2 + metal additions)

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

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

Opalite

Synthetic Opalised Glass

Blue faceted gemstones, likely blue sapphire

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

Diamond (Heart Cut)

Carbon (C)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Diamond (or Diamond Simulant)

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

Diamond (or high-quality simulant like Cubic Zirconia)

Carbon (C) - Native Element

Diamond (or Diamond Simulant)

Carbon (C)

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)

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Hematite

Iron(III) oxide (Fe2O3)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Red faceted gemstone jewelry setting

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

Ametrine

Silicon Dioxide (SiO2) with iron impurities

Cubic Zirconia (Faceted)

Zirconium Dioxide (ZrO2)

Dyed Agate

Chalcedony (SiO2)

Synthetic Sapphire and Ion-X Glass

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

Opalite

Synthetic Glass (Simulated Opal)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Diamond (or Clear Quartz / Cubic Zirconia)

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

Dyed Agate

Agate (Cryptocrystalline Quartz), SiO2

Biotite-bearing granite or gneiss

Felsic granitoid; chiefly quartz, feldspar, and biotite mica

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Diamond (or synthetic simulant)

Cubic C (Carbon)

Citrine

Citrine (Silicon Dioxide, SiO2)

Blue Goldstone

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

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic ZrO₂), possibly glass or quartz