Rajaratna Ruby
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At 2,475 carats (495 g), the Rajaratna Ruby is one of the world's largest ruby crystals, but unforunately it is more of specimen than gem quality. An 18,696 carats (3.739 kg) crystal exists [1] and there is a 21,450 carats (4.29 kg) piece from Myanmar.[2] The "Chaiyo Ruby" is another large example, weighing 109,000 carats (22 kg).
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