Estimated at $35-50 million, the Golconda Blue Diamond would have been the largest blue diamond of its quality ever offered at auction, presented in a stunning ring by legendary Parisian jeweller ...

Tiffany & Co. Blue Book Urchin Fancy Intense Yellow Diamond Ring Tiffany & Co. Another blockbuster stone had important symbolic weight. A yellow diamond necklace was cut to 18.37-carats to honor ...