Man Made Object (Ring)

Chrysoprase

Chalcedony (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Polished ocean jasper (orbicular jasper)

Silicified volcanic rock; chiefly microcrystalline quartz/chalcedony (SiO₂), with iron oxides and other alteration minerals

Turquoise ring cabochon

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or treated matrix turquoise

Carnelian

Carnelian (SiO2 with Fe2O3 impurities)

Petrified Wood

Silicified Wood (primarily SiO2)

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Polished red jasper beads

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Polished agate bead bracelet

Agate, a banded microcrystalline variety of quartz (SiO₂), likely mixed-color dyed or naturally colored chalcedony

Multi-stone gemstone ring

Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy

Eye Agate

Band Chalcedony (Silicon Dioxide, SiO2)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Multicolored gemstone ring, likely set with tourmaline or mixed colored stones

Unidentifiable from the image; possible tourmaline (complex borosilicate) and/or other colored gemstones in a metal setting

Green Chalcedony Ring

Silicon Dioxide (SiO2)

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Petrified Wood

Silicified Wood (SiO2)

Polished dark gemstone, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Pink faceted gemstone, likely synthetic cubic zirconia or pink sapphire

Uncertain from image; possible zirconium dioxide (cubic zirconia, ZrO₂) or corundum (pink sapphire, Al₂O₃)

Fossilized wood or bone fragment

Indeterminate permineralized organic fossil; possibly silicified wood or fossil bone

Quartzite with Quartz Vein

SiO2 (Metamorphosed Quartz Sandstone)

Petrified Wood

Silicified Wood (SiO2)

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Agate

Silicon Dioxide (Chalcedony), SiO2

Banded agate (likely petrified wood)

Silicified wood, chiefly microcrystalline quartz (SiO₂), with iron-oxide inclusions

Agate

Silicon dioxide (Chalcedony), SiO2

Blue chalcedony bead necklace

Chalcedony, microcrystalline quartz (SiO₂), commonly blue-dyed or blue-gray natural chalcedony

Amethyst cabochon ring

Amethyst, purple quartz (SiO₂)

Petrified Wood

Silicified wood (Quartz replacement of organic wood structure)

Slate

Foliated Metamorphic Rock

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Amethyst, Aquamarine, and Pearl Ring

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

Agate

Silicon Dioxide (Chalcedony), SiO2

Lake Superior Agate

Chalcedony (cryptocrystalline Quartz), SiO2