Organic Gemstone (Not A Mineral)

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

Amethyst (Purple), Sulfur (Yellow), and Blue Apatite

SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)

Turquoise

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

Rose Quartz

Silicon dioxide (SiO2)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Quartz

Silicon Dioxide (SiO2)

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with ferric impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Emerald

Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.

Pearl

Aragonite and Calcite (CaCO3) with Conchiolin

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Jasper (Multi-color Chert)

Silicon Dioxide (SiO2) with impurities

Chert (Jasper variation)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Hematite

Iron(III) oxide (Fe2O3)

Carnelian

Carnelian (Silicate mineral, SiO2)

Amethyst

Amethyst (Silica mineral, SiO2)

Moonstone

Orthoclase feldspar ((K,Na)AlSi3O8)

Chert (Jasper/Common Opal transition)

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Turquoise (possible Howlite imitation)

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

Chert (Nodule)

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3) with Chromium traces

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hematite

Iron(III) oxide (Fe2O3)

Jasper

Silicon Dioxide (SiO2)

Sunstone (Feldspar variety)

(Ca,Na)(Al,Si)4O8 with Hematite or Goethite inclusions

Diamond in Gold Setting

Diamond (C - pure carbon)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)