RAJARATNA RUBY

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