Synthetic Polymer (Synthetic Material)

Amethyst jewelry centerpiece

Amethyst, purple quartz (SiO₂), likely set with colorless diamonds or other gems

Banded Black Onyx (Chalcedony)

Silicon Dioxide (SiO₂)

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Silicon

Element Si

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

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

Blue Agate Geode (Dyed)

Cryptocrystalline Quartz (SiO2)

Turquoise cabochon jewelry

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Diamond (or high-quality simulant like Cubic Zirconia)

Carbon (C) - Native Element

Polished labradorite cabochon

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

Ruby

Corundum (Al2O3 with Chromium traces)

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Diamond

Diamond (C)

Faceted quartz crystal sphere (likely rock crystal)

Quartz, silicon dioxide (SiO₂)

Beach Pebble Quartzite / Chalcedony Pebble

Silicon Dioxide (SiO2)

Emerald

Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Opal cabochon

Opal, hydrated amorphous silica (SiO₂·nH₂O), likely common or Ethiopian precious opal

Diamond ring (likely diamond with gold band)

Diamond, crystalline carbon (C); band appears gold alloy

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Cut gemstone ring, likely diamond

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

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Ruby (in jewelry)

Corundum (Al2O3 with Chromium traces)

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Engineered Quartz

Engineered Stone (primarily SiO2)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities and natural radiation

Tourmalinated Quartz

Crystalline Silicon Dioxide with Schorl inclusions (SiO2 + NaFe3Al6(BO3)3Si6O18(OH)4)

Ruby (set in a gold pendant)

Ruby (Variety of Corundum, Al2O3)

Gold and Cubic Zirconia (San Judas Tadeo Pendant)

Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation

Amethyst ring

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

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)