Ruby (Raw Corundum)
Alumina (Al2O3) with Chromium traces
gemstone
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Red/Brown)
Arenite (SiO2 dominated with iron oxides)
sedimentary
Schist
Mica Schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Garnet
Garnet Group (formula varies: e.g., Almandine Fe3Al2Si3O12 or Pyrope Mg3Al2Si3O12)
gemstone
Orange Sapphire
Corundum (Al2O3)
gemstone
Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite or Limonite staining
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pegmatite
Pegmatitic Granite containing Quartz, Feldspar, and Schorl
igneous
Diamond
Native Carbon (C)
gemstone
Yellow Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Quartzite pebble
Quartzite (SiO2)
metamorphic
Diamond (Faceted)
Carbon (C)
gemstone
Quartzite
Quartzite (SiO2)
metamorphic
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone
Gold-bearing Quartz (Auriferous Quartz)
Quartz (SiO2) with native Gold (Au) inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with possible fossil inclusions
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
mineral
Muscovite Schist with Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Diamond
Carbon (C)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Ruby (Raw Corundum)
Corundum (Al2O3 with Chromium impurities)
mineral
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Diamond inlaid in Jewelry
Carbon (C)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic