To celebrate July's birthstone, here are two of the world's most gorgeous and expensive rubies! Which one is your favorite? On the left is the "Crimson Flame," a 15 carat Burmese ruby that sold for $18 million in December 2015, setting the world-record for price-per-carat for a ruby. On the right is another stunning gemstone, “Sunrise Ruby,” a 25.59 carat Cartier ruby. It sold at auction in May 2016 for $30 million, FAR exceeding its estimate of $18 million, and setting the record for a Cartier jewel at auction. Wow!
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