This combination of corundum and titanium is rare on Earth, though not as rare as that of corundum with chromium, which results in ruby. The Queen of Sheba’s sapphire mines have long been legendary.The blue colour is a result of titanium permeating the stone. One of the longest sought-after gemstones and most desired in blue, it has been used in jewellery and to store wealth for thousands of years.
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