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The auction record price per carat for ruby is the sale of an 8.62-carat cushion-cut 'pigeon's-blood red' unheated Burmese stone: $3,637,480 ($425,000 per carat). Purchased by Laurence Graff at Christie's. Set in a Bulgari rectangular-shaped diamond bombé mount, ring size , 18k gold. (15 February 2006, St. Moritz Palace Hotel, Geneva: Lot 352/Sale 1334)

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