gemstone

Opal

Hydrated amorphous silica, SiO2·nH2O

Hardness of 5.5-6.5 on the Mohs scale, exhibits a play-of-color, subvitreous to pearly luster, and lacks a crystalline structure being amorphous.

Identified October 20, 2026More gemstone →

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Physical properties

Hardness of 5.5-6.5 on the Mohs scale, exhibits a play-of-color, subvitreous to pearly luster, and lacks a crystalline structure being amorphous.

Formed from silica-rich solutions seeping into cracks and voids in sedimentary or volcanic rocks, often over millions of years.

Primarily used as a high-end gemstone in jewelry, rings, necklaces, and for specimen collecting.

Opal contains up to 20% water trapped within its microscopic silica spheres, which diffract light to create its rainbow colors.

Identified by its signature play-of-color and amorphous fracture; predominantly sourced from Australia, Ethiopia, and Mexico.

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)

Gemstone Ring

N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ

Amber

Succinite (Organic Gemstone)

Diamond and Gold Jewelry

Carbon (Diamond) / Au (Gold)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin