gemstone
Yellow Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectMohs hardness of 9; yellow to orange-yellow color; adamantine to vitreous luster; trigonal crystal system; no cleavage with conchoidal fracture.
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Physical properties
Mohs hardness of 9; yellow to orange-yellow color; adamantine to vitreous luster; trigonal crystal system; no cleavage with conchoidal fracture.
Formation & geological history
Formed in metamorphic or igneous rocks like pegmatites and marble through high-temperature and pressure processes over millions of years.
Uses & applications
Used extensively in high-end jewelry, watch bearings, and industrial cutting tools.
Geological facts
Sapphires are second only to diamonds in natural hardness, and yellow varieties are sometimes associated with prosperity in gemstone lore.
Field identification & locations
Identified by its extreme hardness, high density, and characteristic crystal habit or rounded alluvial pebble shape. Found primarily in Sri Lanka, Madagascar, and Australia.
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