Not A Rock (Synthetic Material)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Red synthetic corundum (ruby-colored lab-grown sapphire)

Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored

Tumbled amethyst

Amethyst, purple quartz (SiO₂), colored by trace iron and irradiation

Tumbled amethyst

Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Cubic Zirconia (Set in Jewelry)

Zirconium Dioxide (ZrO2)

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Blue slag glass / industrial glass fragment

Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag

Opalite

Man-made glass (traditionally simulated Opal)

Faceted color-change gemstone, likely synthetic alexandrite or glass imitation

Alexandrite: chrysoberyl, BeAl₂O₄; exact identification requires gemological testing

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); exact identity cannot be confirmed from the glare-heavy image

Amethyst gemstone ring

Quartz, purple variety — SiO₂

White cabochon gemstone, likely agate or chalcedony

Cryptocrystalline quartz (SiO₂), probably chalcedony/agate; exact identification is uncertain from the overexposed image

Blue gemstone ring, likely blue topaz or synthetic blue spinel

Likely topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); identification is uncertain from the image

Faceted clear gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); exact identity is uncertain because the strong flash and cut obscure diagnostic features

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Polished blue stone, likely sodalite or dyed agate

Most consistent with sodalite (Na₈(Al₆Si₆O₂₄)Cl₂), though the image cannot confirm composition

Pink/red faceted gemstone, likely synthetic ruby or pink sapphire

Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Red corundum (ruby-colored polished crystal)

Corundum, aluminum oxide (Al₂O₃); red color is typically caused by chromium

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Green faceted bead strand, likely dyed or synthetic material

Uncertain; possibly green-dyed quartz, glass, or lab-created emerald-like material

Tumbled hematite

Hematite (Fe₂O₃), commonly sold as “magnetic hematite” when synthetic or magnetized

Raw ruby (corundum)

Ruby variety of corundum, aluminum oxide (Al₂O₃), colored chiefly by chromium

Polished hematite

Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen

Green gemstone ring, likely emerald simulant or jade

Uncertain; possible beryl (emerald, Be₃Al₂Si₆O₁₈) or jadeite (NaAlSi₂O₆), but the blurred image may show synthetic glass or another treated stone

Yellow faceted gemstone earrings, likely citrine or yellow beryl

Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Cubic Zirconia (Simulated Diamond)

Zirconium dioxide (ZrO2)

Opal ring

Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)

Not a geological specimen

N/A (man-made object)

Blue sapphire

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

Faceted colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (quartz, SiO₂); identity is uncertain because the photograph shows only intense facet reflections

Gemstone-set silver jewelry piece

Likely mixed faceted gemstones in a silver-colored metal setting; stones may include sapphire, ruby/garnet, and yellow sapphire or citrine, but the image is insufficient for species-level identification.

Hematite

Iron(III) oxide, Fe2O3

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Amethyst (faceted gemstone)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)

Turquoise cabochon or turquoise-bearing material

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

Carborundum (Silicon Carbide)

Silicon carbide (SiC)