Rock Identifier

Category

Gemstone

Browse gemstone specimens identified by the Rock Identifier community.

Learn about Gemstone in the encyclopedia

Achroite

Alexandrite

Almandine Garnet

Almandine Garnet

Amber

Andamooka Opal

Andesine

Andesine-Labradorite

Andesine-Labradorite

Andradite Garnet

Andradite Garnet

Ant Hill Garnet

Ant Hill Garnet

Aquamarine

Australian Opal

Australian Opal

Aventurine Feldspar

Aventurine Feldspar

Quartz Pebble (Silicon dioxide (SiO2)) — mineral

Quartz Pebble

Silicon dioxide (SiO2)

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

Turquoise

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

Ruby ring (Corundum (Al₂O₃), red variety colored mainly by chromium) — gemstone

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Faceted yellow-brown gemstone ring (Likely citrine (quartz, SiO₂); the image alone cannot confirm the stone or any treatments.) — gemstone

Faceted yellow-brown gemstone ring

Likely citrine (quartz, SiO₂); the image alone cannot confirm the stone or any treatments.

Peridot (Forsterite-Fayalite (Olivine group), (Mg,Fe)2SiO4) — gemstone

Peridot

Forsterite-Fayalite (Olivine group), (Mg,Fe)2SiO4

Emerald (Beryl (Be₃Al₂Si₆Oထ₈) with Chromium/Vanadium impurities) — gemstone

Emerald

Beryl (Be₃Al₂Si₆Oထ₈) with Chromium/Vanadium impurities

Pearl (Calcium Carbonate (primarily Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (primarily Aragonite and Calcite), CaCO3

Pearl (Calcium carbonate (principally Aragonite, CaCO3) with Conchiolin) — gemstone

Pearl

Calcium carbonate (principally Aragonite, CaCO3) with Conchiolin

Blue-green faceted pendant stone (Undetermined; possibly synthetic glass or a blue-green gemstone such as topaz or quartz) — gemstone

Blue-green faceted pendant stone

Undetermined; possibly synthetic glass or a blue-green gemstone such as topaz or quartz

Diamond ring (center stone appears to be a diamond) (Diamond, crystalline carbon (C); the setting is gold-colored metal) — gemstone

Diamond ring (center stone appears to be a diamond)

Diamond, crystalline carbon (C); the setting is gold-colored metal

Dragon Vein Agate (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Dragon Vein Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Orange chalcedony pebble (likely carnelian) (Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian) — mineral

Orange chalcedony pebble (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Amethyst cluster (Amethyst, purple quartz (SiO₂)) — mineral

Amethyst cluster

Amethyst, purple quartz (SiO₂)

Peridot (Olivine (Mg,Fe)2SiO4) — gemstone

Peridot

Olivine (Mg,Fe)2SiO4

Pearl (Calcium carbonate (CaCO3) in the form of aragonite) — gemstone

Pearl

Calcium carbonate (CaCO3) in the form of aragonite

Blue Topaz (Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2) — gemstone

Blue Topaz

Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2

Turquoise (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Black Pearl (Tahitian or Irradiated Type) (Organic gemstone (Calcium Carbonate with Conchiolin Binding)) — mineraloid

Black Pearl (Tahitian or Irradiated Type)

Organic gemstone (Calcium Carbonate with Conchiolin Binding)

Turquoise (Copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Aquamarine (Beryl (Be3Al2Si6O18)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18)

Spessartine Garnet (Mn3Al2(SiO4)3) — gemstone

Spessartine Garnet

Mn3Al2(SiO4)3

Zebra Jasper (Tetragonal Silicon Dioxide (Quartz) with impurities) — sedimentary

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Carnelian (Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities) — mineral

Carnelian

Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities

Amethyst (Carved Wolf Mini Figurine) (Silicon Dioxide (SiO2)) — gemstone

Amethyst (Carved Wolf Mini Figurine)

Silicon Dioxide (SiO2)

Pearl (Calcium Carbonate (primarily Aragonite and Calcite), CaCO3) — mineral

Pearl

Calcium Carbonate (primarily Aragonite and Calcite), CaCO3

Peridot (Olivine (Mg, Fe)2SiO4) — Mineral

Peridot

Olivine (Mg, Fe)2SiO4

Prehnite (Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate)) — mineral

Prehnite

Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate)

Lake Superior Agate (Silicon Dioxide (Chalcedony), SiO2) — mineral

Lake Superior Agate

Silicon Dioxide (Chalcedony), SiO2

Opalite (likely man-made glass) (Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives) — mineral

Opalite (likely man-made glass)

Opalite is a trade name for opalescent glass, not a natural mineral; composition is typically silica glass with additives

Polished carnelian agate (Carnelian, a translucent orange variety of chalcedony (microcrystalline quartz, SiO₂)) — gemstone

Polished carnelian agate

Carnelian, a translucent orange variety of chalcedony (microcrystalline quartz, SiO₂)

Rhodochrosite (Rhodochrosite (MnCO3)) — mineral

Rhodochrosite

Rhodochrosite (MnCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (SiO2 (Silicon Dioxide)) — mineral

Quartz

SiO2 (Silicon Dioxide)

Precious Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Likely polished blue-green gemstone (Indeterminate from image; possibilities include sapphire (corundum, Al₂O₃), aquamarine (beryl, Be₃Al₂Si₆O₁₈), or blue-green tourmaline) — gemstone

Likely polished blue-green gemstone

Indeterminate from image; possibilities include sapphire (corundum, Al₂O₃), aquamarine (beryl, Be₃Al₂Si₆O₁₈), or blue-green tourmaline

Tiger’s eye (Quartz variety with fibrous crocidolite-derived inclusions; chiefly SiO₂) — gemstone

Tiger’s eye

Quartz variety with fibrous crocidolite-derived inclusions; chiefly SiO₂

Peridot (Olivine ((Mg,Fe)2SiO4)) — gemstone

Peridot

Olivine ((Mg,Fe)2SiO4)

Gem-set gold ring (Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring) — gemstone

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

Beaded Jewelry (Assorted Gemstones) (Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ) — Mineral, Jewelry

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Mineral, Jewelry

Dyed Agate / Quartz (Tumbled) (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Agate / Quartz (Tumbled)

Silicon Dioxide (SiO2) with artificial dye

Green Quartz (Prasiolite) (Silicon Dioxide (SiO2)) — mineral

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2)