Synthetic (Not A Natural Rock)

Blue gemstone, likely iolite or blue sapphire

Iolite (cordierite, Mg₂Al₄Si₅O₁₈) or corundum (sapphire, Al₂O₃)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Smoky Quartz

Silicon Dioxide (SiO2)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Diamond ring (likely diamond with gold band)

Diamond, crystalline carbon (C); band appears gold alloy

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Quartz-rich pegmatite with drusy quartz

Quartz (SiO₂) in a granitic pegmatite, likely with feldspar and mica inclusions

Amethyst ring

Amethyst, purple quartz (SiO₂), likely set with diamond or other accent stones

Clear quartz crystal sphere

Quartz (silicon dioxide, SiO₂)

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Possible weathered basalt or iron-rich slag

Basalt, tentatively; composition likely plagioclase and pyroxene with possible magnetite

Polished blue-black cabochon, likely blue obsidian or dyed glass-like stone

Indeterminate from image; possible natural obsidian (volcanic glass), commonly SiO₂-rich rhyolitic glass

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Tumbled honey-colored stone, possibly citrine or yellow chalcedony

Uncertain from the photograph; possible quartz (SiO₂), either citrine or chalcedony

Tumbled green beryl or glassy green gemstone

Likely beryl, Be₃Al₂Si₆O₁₈; possibly treated emerald or synthetic glass

Bismuth

Bismuth (Bi)

The user-provided image does not contain a rock or mineral specimen

Rounded brown pebble (rock type undetermined)

Unidentified, iron-stained lithic pebble; composition cannot be determined from the photograph

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions

Strawberry Quartz and Rose Quartz

Silicon Dioxide (SiO2) with inclusions

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Likely weathered pebble or mineral fragment

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

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Smoky Quartz

Silicon Dioxide (SiO2)

Turquoise cabochon or turquoise-bearing material

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

Strawberry Quartz (or Sunstone / Tumbled Quartz)

Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions

Ruby

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Polished honey-yellow quartz-like crystal

Quartz (SiO₂), possibly citrine or heat-treated amethyst

Labradorite cabochon

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

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Smoky Quartz

Silicon Dioxide (SiO2)

Diamond ring (center stone appears to be a diamond)

Diamond, crystalline carbon (C); the setting is gold-colored metal

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Pink faceted gemstone, likely synthetic cubic zirconia or pink sapphire

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

Blue goldstone (man-made glass)

Copper-bearing aventurine glass; synthetic silicate glass

Tumbled amethyst

Amethyst, purple quartz (SiO₂)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)