Organic Gemstone (Fossilized Resin)

Fossilized Shark Teeth

Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)

Petrified Wood

Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)

Ammonite Fossil

Ammonoidea (subclass)

Fossil Coral (Favosites Honeycomb)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Fossil shell fragment, likely bivalve or gastropod

Fossilized calcium-carbonate shell; likely aragonite/calcite replaced by calcite

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Fossil bone fragment, likely vertebrate limb or rib bone

Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate

Amethyst (Resin Carving/Orgonite)

Silicon Dioxide (SiO2) with iron impurities

Pearl

Calcium carbonate (CaCO3) + organic conchiolin

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

Orange tumbled stone, possibly carnelian

Carnelian: orange-red cryptocrystalline quartz, SiO₂ (chalcedony variety)

Mookaite Jasper

Radiolarite (Silica, SiO2)

Freshwater Pearl

Aragonite / Biogenic Calcium Carbonate (CaCO3)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Honey-colored quartz crystal

Quartz (silicon dioxide, SiO₂), likely iron-stained or inclusion-rich citrine

Black Pearl (Tahitian or Irradiated Type)

Organic gemstone (Calcium Carbonate with Conchiolin Binding)

Likely polished chalcedony or agate cabochon pendant

Microcrystalline quartz, SiO₂ (chalcedony/possibly banded agate)

Carnelian agate (likely carnelian geode fragment)

Microcrystalline quartz, SiO₂, chalcedony variety colored by iron oxides

Imitation or Cultured Pearl Earrings

Calcium carbonate (CaCO3) or synthetic polymer/glass

Bivalve Fossil (Mussel or Clam Shell)

Bivalvia

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Pearl (Pendant)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

Dendritic Chert

Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)

Fossil shell fragment (likely bivalve)

Bivalvia indeterminate; shell material chiefly aragonite or calcite (CaCO₃)

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Turquoise

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

Fossilized bivalve shell (small cockle-type shell)

Bivalvia; exact species cannot be determined from the image

Turquoise and Red Coral (with Grizzly Bear Claw)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Fossil tooth fragment

Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Pearl

Aragonite (CaCO3) with Conchiolin

Polished fossil coral fragment

Fossilized colonial coral, commonly Favosites or related tabulate coral

Ring with an Orange Inlay

N/A (Man-made object)

Pearl

Calcium carbonate (principally Aragonite, CaCO3) with Conchiolin

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Banded Chert

Microcrystalline Quartz (SiO2)

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Petoskey Stone

Hexagonaria percarinata

Small quartz pebble or silica-rich mineral fragment

Quartz (SiO₂), tentative

Amethyst, Aquamarine, and Pearl Ring

SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)