RAPAPORT… A step-cut, 16.90-carat, D-color, internally flawless diamond ring with a pre-sale estimate of $1.6 million to $2.2 million will lead Bonhams’ fine jewelry sale in New York on September 19. The type-IIa diamond, set with round, brilliant-cut diamond shoulders, “embodies rarity according to every criterion by which a diamond is measured: color, cut, clarity and Read More →