gemstone

Ruby and Diamond Ring

Corundum (Al2O3) and Diamond (C)

Hardness of 9 for ruby on the Mohs scale, 10 for diamond. Vitreous luster, hexagonal crystal system for corundum, isometric for diamond. Red color in ruby due to chromium impurities, colorless to white for diamond. Specific gravity is approximately 4.0 for ruby and 3.5 for diamond.

Identified August 3, 2026More gemstone →

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Physical properties

Formation & geological history

Rubies form in metamorphic and igneous rocks, specifically in marble or basalt environments where aluminum-rich rocks undergo high-temperature metamorphism. Diamonds form deep in the Earth's mantle under extreme pressure and temperature conditions and are brought to the surface via kimberlite pipes.

Uses & applications

Used primarily in fine jewelry, high-end timepieces, and historically in laser technology (synthetic ruby).

Geological facts

Ruby is one of the traditional cardinal gemstones. The red color comes from trace amounts of the element chromium. Finest quality rubies traditionally come from Myanmar (formerly Burma).

Field identification & locations

Identified by its distinctive deep pinkish-red color, extreme hardness, and brilliant luster when cut and set into precious metal jewelry.

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Gemstone Ring

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

gemstone

Diamond and Gold Jewelry

Carbon (Diamond) / Au (Gold)

gemstone

Ammolite

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

mineral

Cubic Zirconia (simulant) or Diamond

ZrO2 (Cubic Zirconia) or C (Diamond)

gemstone

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Black Opal Ring (Carved Opal)

Hydrated Silicon Dioxide (SiO2·nH2O)

gemstone