Blue Sapphire is a natural occurring gemstone composed of corundum (Aluminum Oxide), and tinged with slight traces of cobalt and some other metals which lead to its beautiful blue hue. Blue Sapphire gemstones has considerable sparkle and might display different colours when viewed from different angles. Sapphires can be heat treated, diffused with beryllium or irradiated to preserve and enhance their blue brilliance-but the naturally occurring coloured sapphires are still the most valued. One of the largest sapphires ever found weighted nearly 42 kilograms, and was discovered in Sri Lanka.
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