Ruby and sapphire same stone6/2/2023 ![]() Sapphire and ruby crystals can grow to large sizes (crystals have been found weighing more than a kilogram). The impurities in corundum gems produce the large range of colours found. ![]() Gems generally get their colour because of certain metals or impurities contained in the mineral. They have the same chemical composition and structure. ![]() Sapphires and rubies are both gem varieties of the mineral corundum. Each of these 41 brilliant cut gems is about 3 mm in diameter. ![]()
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