Antropogenic (Man Made Glass Byproduct)

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Pearl

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

Rough Diamond

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Quartz (in matrix)

Quartz (SiO₂)

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Quartz

Silicon Dioxide (SiO₂)

Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Rough Diamond

Diamond (pure Carbon, C)

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Diamond (in jewelry setting)

Carbon (C)

Pearl

Aragonite (CaCO3) with Conchiolin

Crazy Lace Agate

Chalcedony (Silicon Dioxide, SiO2)

Quartz

Quartz (SiO₂)

Quartz (River-worn Pebble)

Quartz (SiO2)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Quartz

Quartz (SiO2)

Quartz (Milky/River Quartz)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Sandstone

Arenite (general term for sandstone)

Diamond (in jewelry setting)

Adamantine Carbon (C)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Rhodonite

Rhodonite (MnSiO3)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Quartz

Quartz (SiO₂)

Quartz

Quartz (SiO₂)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Turquoise

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

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Smoky Quartz

SiO2 (Silicon Dioxide)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Blue Sapphire

Corundum (Al2O3)