Mineraloid (Man Made)

Quartzite

Metamorphic Quartz Arenite

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Tourmalinated quartz point

Quartz (SiO₂) containing black tourmaline, usually schorl (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Chert (flint) fragment

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a variety of chert

Diamond

Diamond (Pure Carbon, C)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Polished blue-green jasper beads

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Diamond-set gold ring

Diamond (carbon, C) in a gold alloy setting; the clear center stone may be a diamond or a diamond simulant

Gold ring with a clear faceted gemstone

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

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Likely obsidian (rough fragment)

Volcanic glass, predominantly silica-rich rhyolitic composition (SiO₂-rich, noncrystalline)

Diamond (Cluster Ring)

Carbon (C)

Diamond

Carbon (C)

Sandstone (with iron staining)

Quartz Arenite / Ferruginous Sandstone

Sandstone

Clastic Sedimentary Rock

Sandstone

Sedimentary Rock (Quartz arenite)

Quartzite

Quartzite (Metamorphic Quartz Sandstone)

Pink Granite

Phaneritic Felsic Igneous Rock

Veined dark metamorphic rock, likely serpentinite

Serpentinite, predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible quartz, calcite, and magnetite veins

Likely graphite-rich schist

Graphitic schist; chiefly graphite and quartz/mica

Chert (Chert / Flint)

Microcrystalline Quartz (SiO2)

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Pearl

Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)

Rough Diamond

Diamond (pure Carbon, C)

Diamond

Native Carbon (C)

Diamond

Carbon (C)

Rough Diamond

Pure Carbon (C)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Amber

Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)

Limestone

Calcium Carbonate (CaCO3)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Diamond ring

Diamond (crystalline carbon, C) set in a metal ring; the small stones appear diamond-like but cannot be confirmed from the image.

Diamond-set gold ring

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

Gold ring with a clear faceted gemstone

Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal

Mounted faceted gemstone ring

Likely diamond (carbon, C), though the image is insufficient for definitive identification

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Limestone

Calcareous sedimentary rock (CaCO3)

Pearl (in a decorative hair comb setting)

Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin