Man Made Object (Simulant)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Diamond (Set in jewelry)

Cubic Carbon (C)

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Goldstone (Brown)

Aventurine glass

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Flint/chert projectile point

Microcrystalline quartz (SiO₂), archaeologically worked into a bifacial point

Rounded quartz pebble (tentative)

Quartz, silicon dioxide (SiO₂)

Polished ocean jasper cabochon

Orbicular jasper (microcrystalline quartz, SiO₂)

Green cabochon gemstone, likely glass-filled or synthetic emerald imitation

Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass

Moissanite

Silicon Carbide (SiC)

Diamond

Carbon (C)

Diamond (in Jewelry)

Diamond (Carbon, C)

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Chalk

Calcium Carbonate (CaCO3)

Polished carved coral fossil (likely agatized or silicified coral)

Fossilized colonial coral; commonly *Scleractinia* or *Tabulata*, replaced by chalcedony/microcrystalline quartz

Orange Calcite

Calcite (CaCO3)

Nephrite Jade

Nephrite

Fossilized turtle shell or carapace fragment

Indeterminate Testudines; likely a fossil turtle carapace scute/bone

Chelyabinsk Meteorite

Ordinary chondrite (LL5)

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)

Diamond

Carbon (C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Diamond (Colorless/White)

Carbon (C)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Polished black stone, possibly basalt or black jasper

Basalt (fine-grained mafic rock) or microcrystalline quartz if jasper

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Polished orbicular/porphyritic granite or breccia

Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Gold (Elemental Metal)

Gold (Au)

Dark rounded stone, possibly basalt

Likely fine-grained basalt; exact identification is uncertain from the photograph

Faceted colorless gemstone, likely quartz (rock crystal) or synthetic glass imitation

Quartz: silicon dioxide (SiO₂), trigonal crystal system; exact identity cannot be confirmed visually

Diamond

Carbon (C)