Synthetic Or Natural Fiber

Polished agate (likely seam or plume agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with possible quartz and iron-oxide inclusions

Tumbled greenstone (likely nephrite jade)

Nephrite, an interlocking tremolite–actinolite amphibole aggregate; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Sapphire (Blue)

Corundum (Al2O3)

Tumbled carnelian

Carnelian, a red-orange variety of cryptocrystalline chalcedony (SiO₂)

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Polished dark mafic stone, likely basalt or diabase

Basalt/diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine or iron-titanium oxides

Tumbled labradorite beads

Labradorite, a calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Selenite (gypsum) crystal

Gypsum, CaSO₄·2H₂O; fibrous variety often called satin spar

Ring with an Orange Inlay

N/A (Man-made object)

Black tourmaline bead bracelet, possibly mixed with smoky quartz or brown tourmaline

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; exact beads cannot be confirmed visually

Polished hematite bead necklace

Hematite (iron(III) oxide, Fe₂O₃), likely polished beads

Ruby

Corundum (Al2O3 with Chromium impurities)

Tumbled dark green stone, likely nephrite jade or green serpentine

Probably nephrite (interlocking tremolite–actinolite amphibole); alternatively massive serpentine (Mg₃Si₂O₅(OH)₄)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue aventurine quartz (likely)

Quartz, silicon dioxide (SiO₂), probably blue aventurine variety

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Tumbled tiger’s-eye (likely iron-stained quartz)

Quartz, SiO₂, with fibrous crocidolite pseudomorphed by iron oxides

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Turquoise ring

Turquoise, hydrated copper–aluminum phosphate (CuAl₆(PO₄)₄(OH)₈·4H₂O)

Polished yellow-orange chalcedony (likely carnelian or yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Polished dark chalcedony or agate cabochon

Cryptocrystalline quartz, SiO₂; likely brown-red chalcedony/agate

Blue chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Tiger’s eye beads

Tiger’s eye (quartz variety), SiO₂, with pseudomorphic fibrous crocidolite/goethite inclusions

Tumbled blue chalcedony (likely blue agate)

Microcrystalline quartz, SiO₂; chalcedony with possible agate banding

Blue-gray chalcedony cabochon

Chalcedony (microcrystalline quartz), SiO₂; possibly blue lace agate or dyed chalcedony

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); exact identity cannot be confirmed from the glare-heavy image

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Raw ruby (likely corundum)

Corundum, Al₂O₃; red color caused mainly by chromium

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Banded agate (likely polished/tumbled)

Agate, a microcrystalline variety of quartz; SiO₂

Ruby in matrix (likely ruby-bearing corundum)

Corundum, aluminum oxide (Al₂O₃), chromium-bearing variety

Blue quartz crystal (likely synthetic or coated quartz)

Quartz, silicon dioxide (SiO₂); possible aqua-aura quartz

Cut red gemstone in a gold ring

Likely ruby (corundum, Al₂O₃), though red spinel or garnet is also possible from the image

Tiger’s eye

Quartz (SiO₂) with fibrous crocidolite pseudomorphs and iron oxides

Hematite

Iron(III) oxide (Fe2O3)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)

Raw ruby (corundum)

Ruby variety of corundum, aluminum oxide (Al₂O₃), colored chiefly by chromium

Tumbled blue chalcedony

Chalcedony, microcrystalline quartz (SiO₂)

White Sapphire

Corundum (Al2O3)

Tumbled carnelian or orange chalcedony

Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety