gemstone
Yellow Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, yellow to golden color, vitreous to adamantine luster, trigonal crystal system, and a specific gravity of around 4.0.
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Physical properties
Hardness of 9 on the Mohs scale, yellow to golden color, vitreous to adamantine luster, trigonal crystal system, and a specific gravity of around 4.0.
Formation & geological history
Forms in metamorphic and igneous rocks, particularly in aluminum-rich and silicon-poor environments like marble and pegmatites, over millions of years.
Uses & applications
Used primarily in fine jewelry, luxury watches, and industrial applications due to its extreme hardness.
Geological facts
Sapphires are the second hardest natural mineral after diamond. Yellow varieties are often associated with prosperity and wisdom in gem lore.
Field identification & locations
Identified by its high density, superior hardness, and distinctive crystal habits. Commonly found in alluvial deposits in Sri Lanka, Madagascar, and Australia.
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