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.55ctw Average 6x4mm Oval Cut Pink Sapphire - .55ctw average 6x4mm oval cut pink sapphire. it's a variety of the same species as ruby - corundum - and any corundum that doesn't qualify as ruby is considered sapphire. hardness 9 on mohs scale. for centuries sapphire has been associated with royalty and romance. sapphire is a us birthstone for september - $44.95
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