sapphire |ˈsafˌī(ə)r| noun 1 a transparent precious stone, typically blue, which is avariety of corundum (aluminum oxide).• a bright blue color.diamond |ˈdī(ə)mənd|noun1 a precious stone...
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Sapphires are part of the corundum group and are nearly the hardest group of stones known to man registering 9 on the Moh's scale, only...