Ruby

Gemstones

Ruby is a pinkish-red to blood-red gemstone and a variety of corundum composed of aluminium oxide. Its red color is caused by chromium. Rubies are traditional jewelry gems, cardinal gems, and the birthstone for July. Their quality and value depend on color, cut, clarity, and carat weight. Other gem-quality corundum varieties are called sapphires, while some stones historically called rubies are actually spinels.

Mineral variety: Corundum
Color source: Chromium
Traditional birthstone: July

Sources and credits

Article: Ruby (English Wikipedia)
Wikidata: Q43088
Text: Card text is adapted from the English Wikipedia article by an automated summary. Wikipedia content is available under CC BY-SA 4.0; see the article history for its contributors. CC BY-SA 4.0 · Article history and contributors
Illustration: By Robert M. Lavinsky. CC BY-SA 3.0 · File page on Wikimedia Commons
Robert M. Lavinsky, http://www.mindat.org/photo-215330.html
Modifications: Resized and converted to WebP
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