Man Made Object (Simulant)

Carved Stone Turtle

Mixed stone carving

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Ferro-silicate Slag

Industrial Vitrified Slag (High-silica amorphous glass)

Clear faceted gemstone, likely synthetic cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual identification is not definitive and diamond or synthetic moissanite are alternatives

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Man-made Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating/dye

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Serpentinite

Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Blue Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Serpentine

Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Cubic Zirconia

Zirconium dioxide (ZrO2)

Diamond-encrusted microphone-shaped pendant

Diamond (natural or synthetic) set in gold-colored metal; exact stones and metal cannot be confirmed visually

Blue faceted gemstone, likely synthetic spinel or sapphire

Undetermined from image; possible synthetic corundum (Al₂O₃) or spinel (MgAl₂O₄)

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Colorless faceted gemstone, likely synthetic cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); natural diamond is a less likely alternative

Diamond (or Diamond Simulant)

Carbon (C)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

Brown chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a dark variety

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Smelter Slag

Anthropogenic Silicate Slag

Diamond or Cubic Zirconia

Carbon (diamond) or Zirconium dioxide (cubic zirconia)

Diamond (or Cubic Zirconia simulant)

C (Carbon) or ZrO2 (Zirconium Dioxide)

Tumbled blue chalcedony (possibly blue agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Blue chalcedony cabochon (likely)

Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image

Chert (flint), brown variety

Microcrystalline quartz (SiO₂)

Diamond-set gold ring

Diamond (carbon, C) in a gold alloy setting; the image does not establish the stone’s identity or authenticity

Small dark pebble, likely basalt or iron-rich rock

Uncertain from image; possibly fine-grained basalt (mafic silicate rock)

Serpentine

Antigorite/Chrysotile/Lizardite mixture (Mg,Fe)3Si2O5(OH)4

Cubic Zirconia (as used in jewelry setting)

Zirconium dioxide (ZrO2)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Cubic Zirconia (CZ) in Gold-Plated Setting

Cubic Zirconium Dioxide (ZrO2)