Metamorphic (Likely Gneiss Or Schist Based On Texture)

Pink Sapphire

Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Sandstone (Graywacke type)

Clastic Sedimentary Rock (Lithic Sandstone)

Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite (or Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite (River Stone)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone (likely Greywacke variant)

Arenite

Granodiorite Pebble

Granodiorite

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Quartzite with Iron Inclusions

Metamorphosed Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Yellow Chert

Sedimentary cryptocrystalline quartz (SiO2)

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Aquamarine

Beryl (Be₃Al₂Si‑₆O₁₈)

Pearl

Calcium Carbonate (CaCO3) + Conchiolin

Quartz

Quartz (Silicon Dioxide - SiO2)

Quartzite (River Pebble)

Metamorphic Quartzite (primarily SiO2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Emerald

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

Rough Green Tourmaline (Verdelite)

Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Ruby

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Sandstone (Greywacke/Lithic Sandstone)

Arenite (composed primarily of SiO2)

Almandine Garnet & Tumbled Citrine Quartz

Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

Green Calcite

Calcium Carbonate (CaCO3)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Greenstone

Chlorite schist / Meta-basalt

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (primarily SiO2)

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)