Man Made Mineral Simulant (Glass)

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Sea Glass

Silicon dioxide (mostly)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Sea Glass

Man-made vitreous material

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Opalite Egg

Synthetic Glass (Simulated Opal)

Opalite

Synthetic Opalite (Man-made glass)

Small black stone fragment (possibly obsidian)

Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)

Faceted clear gemstone in a gold-colored setting

Unidentified transparent faceted stone; possibly quartz, glass, or another colorless gem

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Goldstone

Man-made glass with copper inclusions

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Diamond (or Diamond Simulant)

Carbon (C)

Sea Glass

Man-made silicate glass

Opalite

Man-made opalescent glass

Gold ring with a clear faceted gemstone

Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal

Sea Glass

Man-made silicate glass

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Obsidian

Volcanic Glass

Sea Glass

Man-made silicate glass

Sea Glass

Man-made silicate glass

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Sea Glass

Man-made silicate glass

Opalite

Synthetic Opalised Glass

Opalite

Man-made Glass (Synthetic Opalized Glass)

Diamond (or Diamond Simulant)

Carbon (C)

Obsidian

Volcanic Glass

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Carved opalite pendant

Opalite (man-made opalescent glass; not a natural mineral)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Opalite

Synthetic Glass (SiO2 + impurities)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Opalite

Synthetic Opalized Glass / Man-made Glass

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Green gemstone ring (likely synthetic or imitation emerald)

Possibly emerald, beryl (Be₃Al₂Si₆O₁₈); the photo cannot confirm the center stone’s identity or whether it is natural.

Blue Obsidian

Volcanic Glass (Amorphous)

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility