Gemstone

Sodalite

Na8Al6Si6O24Cl2

Yellow Beryl

Beryl (Be3Al2(SiO3)6)

Charoite with Aegirine inclusions

(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4.0-3.0 * nH2O + NaFeSi2O6

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Citrine Quartz Sphere

Silicon Dioxide (SiO2)

Moldavite

Moldavite (Silica Glass with impurities)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Pearl

Calcium carbonate (CaCO3) + organic conchiolin

Fire Opal

Hydrated Silica (SiO2·nH2O)

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Gem-set gold ring

Gold alloy setting with a colorless faceted gemstone, possibly quartz or glass; the stone cannot be identified reliably from the image

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Agate

Silicon Dioxide (Chalcedony), SiO2

Smoky Quartz

Silicon Dioxide (SiO2)

Diamond-set gold ring

Diamond (crystalline carbon, C); mounted in a gold alloy setting

Likely quartz cabochon in a ring

Quartz (SiO₂), possibly clear or milky quartz; identification is uncertain from the photograph

Banded Chert

Microcrystalline Quartz (SiO2)

Tumbled carnelian (red-orange chalcedony)

Carnelian, a cryptocrystalline variety of quartz: SiO₂

Malachite-bearing Rock

Cu2CO3(OH)2

Quartz (Smoky Quartz)

Silicon Dioxide (SiO2)

Peridot

Olivine (Mg, Fe)2SiO4

Gem-set gold ring

Likely gold alloy set with a colorless gemstone, possibly diamond or clear quartz; the stone cannot be identified reliably from the image

Color-change gemstone ring (stone possibly alexandrite or a synthetic imitation)

Undetermined from the image; alexandrite is chrysoberyl, BeAl₂O₄

Green faceted gemstone earrings, likely synthetic emerald-colored glass or cubic zirconia

Undetermined; possible glass (amorphous silicate) or synthetic cubic zirconia (ZrO₂)

Chalcedony

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2(SiO3)6)

Yellow Topaz

Al2SiO4(F,OH)2

Larimar

Pectolite (NaCa2Si3O8(OH))

Citrine

Silicon dioxide (Quartz variety), SiO2

Turquoise (likely polished nugget)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Clear Quartz (Faceted)

Silicon dioxide (SiO2)

Ocean Jasper

Orbicular Jasper / SiO2

Turquoise in Matrix

CuAl6(PO4)4(OH)8·4H2O

Blue Topaz

Al2SiO4(F,OH)2

Gold ring with a clear faceted gemstone

Likely colorless diamond (carbon, C); identification from the image is uncertain

Violet faceted gemstone, likely synthetic or simulant

Indeterminate from the image; possible violet sapphire (corundum, Al₂O₃), amethyst (quartz, SiO₂), or glass/another simulant

Rhinestone (or glass crystal)

Silicon dioxide (if glass) / Various

Blue gemstone ring, likely synthetic or natural blue topaz

Topaz, Al₂SiO₄(F,OH)₂ (visual identification uncertain)

Turquoise

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

Citrine

Silicon Dioxide (Quartz variety)

Garnet (Almandine-Pyrope)

Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3