Synthetic (Ceramic)

Pegmatite (Quartz with Tourmaline/Biotite inclusions)

Igneous Pegmatite

Lepidolite

K(Li,Al)3(Al,Si,IV)4O10(F,OH)2

Milky Quartz

Silicon dioxide (SiO2)

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby when red, possibly laboratory-grown

Opalite

Synthetic glass (SiO2 + impurities)

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium

Likely feldspar-rich rock (possibly potassium feldspar)

Probably orthoclase or microcline, KAlSi₃O₈; identification from the image is uncertain

Likely labradorite-bearing pebble; the label also says “carnelian,” but that identification is uncertain

Labradorite, a plagioclase feldspar: approximately (Ca,Na)(Al,Si)₄O₈

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled coral fragment (likely white calcitic coral)

Calcium carbonate, primarily aragonite or calcite (CaCO₃); exact coral genus cannot be determined from the image

Gemstone ring (stones not identifiable from image)

Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants

Rock Crystal (Clear Quartz)

Silicon dioxide (SiO2)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Diamond-set gold ring

Diamond (crystalline carbon, C) set in a gold alloy; the metal and setting are manufactured

Green faceted or cabochon gemstone (possibly glass or synthetic)

Undetermined; possibilities include green beryl (Be₃Al₂Si₆O₁₈), quartz (SiO₂), or synthetic glass

Gemstone rings (stones not reliably identifiable)

The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; the image alone cannot confirm whether it is natural or synthetic

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby is red chromium-bearing corundum

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Polished hematite bead (probable)

Hematite, Fe₂O₃

Coal (likely Bituminous or Lignite)

Organic Sedimentary Rock (Carbonaceous)

Opalite

Synthetic Opalite Glass / Opalized Glass

Tumbled brown-blue stone, possibly sodalite-bearing jasper

Likely quartz-rich jasper with blue sodalite or dumortierite; identification is uncertain from the image

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Limonite

FeO(OH)·nH2O (Hydrated iron oxide)

Tumbled white stone, possibly milky quartz

Likely quartz (SiO₂); identification is uncertain from the photo

Polished dark mafic stone, likely basalt or diabase

Basalt/diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine or iron-titanium oxides

Graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly graphite (C), quartz (SiO₂), and mica minerals

Iron-rich concretion or weathered ironstone

Goethite–hematite-bearing ferruginous concretion; exact identification requires testing

Hematite

Iron(III) oxide (Fe2O3)

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Banded agate (likely Montana/Columbia River-style agate)

Microcrystalline quartz, SiO₂ (chalcedony with mogánite; iron-oxide staining)

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Peach-colored feldspar (likely potassium feldspar)

Orthoclase or microcline, KAlSi₃O₈

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Lepidolite in Quartz Matrix

Lepidolite (K(Li,Al)3(Al,Si)4O10(F,OH)2) in Quartz (SiO2) matrix