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Sapphire green

Sapphire green

    Of a surprising green, the green sapphires are rather unusual. They often consist of yellow and blue zones. However, stones of beautiful quality with a uniform and pronounced color are remarkable.

    To know more about the mineralogy of the green sapphire see Mindat.org->

    Gemological data

    • Chemical formula : Al2 O3
    • Hardness (Mohs) : 9
    • Density : 4
    • Refractive index : ne=1.759-1.761 no=1.767-1.770
    • Birefingence : 0.008 / 0.009
    • Crystal system : Rhombohedral - Trigonal
    • Group : Corundum

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