This wonderful, deep blue octagonal-cut Kashmir sapphire of 11.88 carats, set into a diamond ring, is among the 300 lots at Christie's Magnificent Jewels auction in New York.

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This wonderful, deep blue octagonal-cut Kashmir sapphire of 11.88 carats, set into a diamond ring, is among the 300 lots at Christie's Magnificent Jewels auction in New York.

This wonderful, deep blue octagonal-cut Kashmir sapphire of 11.88 carats, set into a diamond ring, is among the 300 lots at Christie's Magnificent Jewels auction in New York.