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S C A R A B J E W E L L E R Y D E S I G N S T U D I O
C O R U N D U M G R O U P
Rubies and sapphires are part of the corundum group. On the Mohs scale of hardness they are 9. The jump in hardness between corundum and diamond is much more than it seems from the scale. A diamond is 140 times as hard as corundum, but corundum is very hard wearing... seven times as hard as topaz. Corundum can be cut either en cabouchon or faceted
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