Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Ruby Zoisite

Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)

Citrine (or Yellow Chalcedony / Quartz)

Silicon Dioxide (SiO2)

Blue-stone ring, likely set with blue glass or a dark-blue gemstone

The stone cannot be identified reliably from the image; possible sapphire (corundum, Al₂O₃), lapis lazuli, or glass

Quartz vein rock with iron-oxide staining

Milky quartz (SiO₂), locally stained by hematite/goethite; possible feldspar or host-rock fragments

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Quartz Pebble

Silicon Dioxide (SiO2)

Anthracite Coal

Carbon (with organic impurities)

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Citrine

Silicon dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Amber

Succinite (with a generalized formula of C10H16O)

Brown Jasper / Chert Pebbles

Microcrystalline Quartz (SiO2) with iron oxide impurities

Quartz Pebble (Tumbled / River Pebble)

Silicon Dioxide (SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Clear Quartz (Cut/Faceted Gemstone)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Chert Nodule

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), likely massive milky quartz

Hematite / Jasper

Iron(III) oxide (Fe2O3) in Quartz (SiO2)

Polished amber-like yellow stone

Likely citrine or yellow jasper; exact identification requires testing

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Nodule/Common Chert)

Microcrystalline quartz (SiO2)

Tumbled black stone, likely black agate or onyx

Microcrystalline quartz (SiO₂), probably chalcedony/black agate; exact identification requires testing

Amber Chert (Jasper)

Microcrystalline Quartz (SiO2)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Quartz (Tumbled)

SiO2 (Silicon Dioxide)

Citrine Quartz

Silicon Dioxide (SiO2)