Ruby
Ruby is the red, gem-quality variety of corundum — the same mineral as sapphire — and at Mohs 9 it is the second-hardest gem after diamond, which makes it one of the few colored stones tough enough for everyday wear.
Ruby is the red, gem-quality variety of corundum — the same mineral as sapphire — and at Mohs 9 it is the second-hardest gem after diamond, which makes it one of the few colored stones tough enough for everyday wear.
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