Mineraloid Like Synthetic Material

Blue sapphire (rough corundum)

Corundum, Al₂O₃; blue color commonly from trace iron and titanium

Amber in Matrix

Succinite (Carbon-based organic polymer)

Likely bismuth crystal

Synthetic bismuth (Bi), crystallized from molten metal; not a natural rock-forming specimen

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Faceted red gemstone, likely synthetic ruby or red spinel

Possibly corundum (Al₂O₃, ruby) or spinel (MgAl₂O₄); identity cannot be confirmed from the image

Red gemstone ring; likely synthetic ruby or red glass

Undetermined from the image; ruby is corundum (Al₂O₃), while red glass is amorphous silicate

Obsidian

Volcanic glass (high silica volcanic rock)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Green faceted gemstone earrings

Undetermined; possibly green glass or synthetic emerald-type material, rather than identifiable natural emerald

Likely weathered pebble or mineral fragment

Indeterminate; possibly quartz-rich stone, iron-stained feldspar, or a small chert fragment

Tumbled blue-green stone, possibly aquamarine or chalcedony

Indeterminate from image; possibilities include beryl (Be₃Al₂Si₆O₁₈) or cryptocrystalline quartz (SiO₂)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Obsidian

Obsidian (Volcanic Glass, SiO2)

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Opal

Hydrated silica (SiO2 · nH2O)

Opalite

Synthesized glass / Silicon dioxide glass

Opal-like cabochon ring stone

Likely common opal (hydrated amorphous silica, SiO₂·nH₂O); exact material uncertain from the photograph

Green cut gemstone, likely synthetic emerald or glass imitation

Undetermined; natural emerald is beryl (Be₃Al₂Si₆O₁₈), while the vivid, very uniform appearance may indicate imitation material

Faceted black gemstone, likely black spinel

Spinel (MgAl₂O₄); identification from the image is uncertain

Faceted clear gemstone in a gold-tone ring

Likely colorless quartz (SiO₂); the image does not establish the stone identity, and glass or another gem is possible

Green Opal

Hydrated amorphous silica (SiO2·nH2O)

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

Pink faceted gemstone, likely synthetic or treated quartz

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

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Opalite

Synthetic Silicon Dioxide (SiO2)

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

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

Obsidian

Obsidian (Volcanic Glass)

Conch Pearl

Calcareous concretion (CaCO3)

Red cabochon gemstone ring, likely synthetic ruby or red glass

Possibly corundum (Al₂O₃, chromium-colored); identity cannot be confirmed from the image

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Diamond-set gold ring (stone identity uncertain)

Possible diamond (crystalline carbon, C); metal setting appears gold-colored

Pearls

Aragonite (calcium carbonate) and Conchiolin

Moissanite

Silicon Carbide (SiC)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Likely obsidian (possibly tektite or slag glass)

Volcanic glass; primarily SiO₂, noncrystalline

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Amber

Succinates (Fossilized Tree Resin)

Red cut gemstone, likely synthetic ruby

Corundum (Al₂O₃); possibly lab-grown ruby or red glass imitation