Diamond is renowned as a material with superlative physical ...
Tourmaline is a crystal boron silicate mineral compounded ...
Opal is a hydrated amorphous form of silica; its water ...
A large 105-carat diamond that was set in the crown of ...
793 carat, when it was first discovered. It is considered ...
A ruby is a pink to blood-red colored gemstone, a variety ...
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