Organic Gemstone (Sedimentary Classification)

Labradorite (Gray Tumbled)

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

Citrine

Silicon Dioxide (SiO2)

Amazonite

Amazonite (KAlSi3O8)

Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

Star Ruby

Corundum (Al2O3 with chromium and rutile inclusions)

Black Pearl (Tahitian Style)

Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin

Quartz (specifically Rose or Smoky tinted Quartz)

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Rough Quartz (var. Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Amethyst

Silicon dioxide / Quartz (SiO2+Fe4+)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Quartz Pebble

Silicon Dioxide (SiO2)

Bronzite

Enstatite (var. Bronzite), (Mg,Fe)SiO3

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Sunstone

Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8

Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Smoky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Purple Banded Agate

Cryptocrystalline Quartz (SiO2)

Zoisite with Ruby

Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Emerald

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

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Paraiba Tourmaline

Elbaite Tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) - Copper-bearing

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Green Tourmaline

Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4

Olivine (Peridot)

Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Amethyst (Quartz)

Amethyst (Silicon Dioxide with Iron impurities), SiO2

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Peridot

Olivine (Mg, Fe)2SiO4

Kunzite (Spodumene)

Spodumene (LiAlSi2O6)