Man Made Object (Ring)

Turquoise cabochon ring

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

Diamond (in Ring Setting)

Diamond (C)

Ruby (in a ring setting)

Corundum (Al2O3:Cr)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Petrified Wood

Silicified Wood (SiO2)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Smoky quartz ring

Quartz (SiO₂), likely smoky quartz; the surrounding stones and metal cannot be identified reliably from the image.

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified wood (likely silicified wood)

Silicified xylem, composed mainly of microcrystalline quartz (SiO₂)

Fossiliferous Limestone (Crinoid stem fragments)

Bioclast-bearing Carbonate Rock (Caco3)

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Likely diamond accent

Diamond (crystalline carbon, C)

Pumice

Pumice (a highly vesicular volcanic glass)

Anyolite (Ruby in Zoisite)

Zoisite with inclusions of Corundum; Ca2Al3(SiO4)3(OH) + Al2O3

Polished fossiliferous limestone

Fossiliferous micrite/bioclastic limestone, likely crinoidal or shell-rich limestone

Spherulitic Agate / Moss Agate

Chalcedony (SiO2) with mineral inclusions

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Jadeite (Jade Ring)

NaAlSi2O6 (Sodium Aluminum Silicate)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Slate

Foliated metamorphic rock (Slate)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Fossilized Wood / Petrified Wood

Petrified Wood (Silicified Flora)

Petrified Wood

Silicified Wood (primarily SiO2)

Amethyst (as seen in jewelry)

Amethyst (Silicon Dioxide SiO2 + Fe4+)

Petrified Wood

Silicified Wood (primarily SiO2)

River Pebble (likely Quartzite or Siltstone)

Sedimentary Clast (SiO2 based)

Blue chalcedony cabochon, possibly Larimar

Chalcedony (microcrystalline quartz, SiO₂); if genuine Larimar, blue pectolite, NaCa₂Si₃O₈(OH)

Green Jade (specifically Nephrite)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Amethyst cabochon ring

Amethyst, purple quartz (SiO₂), colored primarily by iron-related defects and irradiation

Blue sapphire ring

Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium

Petrified Wood

Silicified Wood (primarily quartz/chalcedony replacing organic wood structure, SiO2)

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Faceted yellow-brown gemstone ring, likely citrine

Citrine (iron-bearing quartz, SiO₂); identification from the photo is uncertain

Likely weathered pebble or mineral fragment

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

Polished petrified wood

Silicified wood; predominantly microcrystalline quartz (SiO₂), often chalcedony

Carnelian (Chalcedony variety)

SiO2 (Silicon Dioxide)

Diamond engagement ring

Diamond, crystalline carbon (C)

Smoky quartz ring

Quartz, SiO₂ (likely smoky quartz)

Moonstone cabochon ring

Adularia moonstone, potassium feldspar (orthoclase, KAlSi₃O₈), possibly imitation or another white translucent gemstone