Corundum Value, Price, and Jewelry InformationGem-quality corundum is also quite rare. These factors make both varieties of corundum some of the most highly desired jewelry stones. Ruby is the red variety.stone corundum ruby crusher surabayajual,Corundum: The mineral Corundum, Sapphire, Ruby info & picturesCorundum is best known for its gem varieties, Ruby and Sapphire. . Some dark blue stones from certain localities may also be made a bright blue desirable.Ruby Quality Factors - GIAThe GIA Laboratory uses a controlled set of comparison stones called masterstones to determine if corundum is ruby or if it's pink, purple, or orange sapphire.
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