The 29ct sapphire from Kashmir in Cartier's Bleu-Bleuet ring is extremely rare because the Kashmir mine from which it hails - situated at an altitude of 4,000m in the Himalayas – has almost been depleted.

The 29ct sapphire from Kashmir in Cartier's Bleu-Bleuet ring is extremely rare because the Kashmir mine from which it hails - situated at an altitude of 4,000m in the Himalayas – has almost been depleted.

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