Synthetic (Ceramic)

Green faceted gemstone, likely emerald or synthetic emerald

Beryl, Be₃Al₂Si₆O₁₈, colored green by chromium and/or vanadium; identity cannot be confirmed visually

Lapidary Wax (imitation/wax model)

Hydrocarbon wax blend with colorant (imitating Lapis Lazuli/Emerald)

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Decorative gemstone bracelet or jewelry

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

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Raw ruby (corundum)

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

Ruby (varietal of Corundum)

Corundum (Al2O3:Cr)

Coal (Bituminous or Anthracite)

Carbonaceous Sedimentary Rock

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Ruby

Corundum (Al2O3 with Chromium trace)

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Smoky Quartz

Silicon Dioxide (SiO2)

Polished pink corundum (likely treated ruby)

Corundum, aluminum oxide (Al₂O₃); ruby when red-to-pink from chromium

Tumbled tiger’s-eye

Quartz variety, fibrous golden-brown SiO₂ (pseudomorphic quartz after crocidolite)

Blue gemstone, likely tumbled sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively spinel (MgAl₂O₄)

Hematite

Iron(III) oxide (Fe2O3)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Bismuth

Bismuth (Bi)

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Blue Sapphire

Corundum (Al2O3)

Fossilized dinosaur eggs (probable replicas or heavily prepared specimens)

Fossilized dinosaur eggshell, commonly attributed to sauropod or theropod eggs; exact taxon cannot be determined visually

White quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled orange-brown feldspar, likely sunstone or aventurine feldspar

Potassium feldspar, commonly orthoclase or oligoclase; approximate composition KAlSi₃O₈–NaAlSi₃O₈

Blue kyanite crystal

Kyanite, Al₂SiO₅

Tumbled pink feldspar (likely orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Celestite (Celectine)

Strontium sulfate (SrSO4)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Lepidolite on Pegmatite

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Pink/red faceted gemstone, likely synthetic corundum or glass imitation

Corundum (Al₂O₃), ruby/sapphire variety; exact identification requires testing

Ruby ring (likely synthetic ruby)

Corundum, Al₂O₃; red color from chromium. The image alone cannot establish whether the stone is natural or lab-grown.

Pyrite

Iron Sulfide (FeS2)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Polished purple gemstone, likely amethyst

Amethyst: purple quartz, silicon dioxide (SiO₂)

Blue sapphire ring

Corundum (aluminum oxide, Al₂O₃), likely heat-treated sapphire

Amethyst gemstone ring

Quartz, purple variety — SiO₂

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)