Antique sapphire and diamond engagement ring made in 1909. Antique engagement rings are as popular today as ever before thanks to their traditional and practical designs. Sapphires, rubies and diamonds have always been popular gemstones for engagement rings thanks to not just their colour, but importantly their hardness and durability. Indeed sapphire and ruby, which both come from the same gemstone family called corundum, have a Moh’s hardness rating of 9 with diamond being at the top with a 10.
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