Metamorphic Or Igneous

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Emerald

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

Rutilated Quartz

Rutile in Quartz (SiO2 with TiO2 inclusions)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Gold Ore

Native Gold (Au) in Matrix

Bornite

Bornite (Cu5FeS4)

Rutilated Quartz (with Garnet pendant)

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Ruby (Pink to Red Corundum)

Al2O3 (Corundum with Chromium impurities)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Emerald

Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Labradorite

(Ca,Na)(Al,Si)4O8

Ruby (Raw Corundum)

Corundum (Al2O3:Cr)

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Prasiolite (Green Quartz)

Silicon Dioxide (SiO2) with iron impurities

Black Diamond / Black Sapphire

Carbon (C) or Corundum (Al2O3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Rose Quartz

Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)

Pyrite on Quartz (Fool's Gold in Quartz)

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Migmatite

Migmatite (Mixed Rock)

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Amazonite

Amazonite (Microcline Feldspar) K(AlSi3O8)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)