Lot 2057. Important 12.87 carats 'royal blue' Kashmir sapphire and diamond ring, Tabbah. Estimate HK$13,500,000 - HK$18,000,000 (US$1,700,000-2,200,000). © Christie's Image Ltd 2019 Cushion-shaped sapphire of 12.87 carats, circular, pear and marquise-cut...

Lot 365. Superb 14.01 carats no heating 'royal blue' Kashmir sapphire and diamond ring, 1930s. Estimate 950,000 — 1,430,000 CHF . © Sothebys 2018 The cushion-shaped sapphire weighing 14.01 carats, set in a mount embellished with brilliant-, single-cut...