A 7.54 carats Burmese sapphire and diamond ring, by Boucheron. Estimate £40,000 - 60,000 ( €55,000 - 82,000) . Photo: Bonhams. The rectangular step-cut sapphire, weighing 7.54 carats, between tapered baguette and brilliant-cut diamond shoulders, signed...

Platinum, Emerald, Sapphire and Diamond Ring - Photo Sotheby's Centered by a rectangular step-cut emerald weighing 7.09 carats, flanked by two rectangular step-cut sapphires weighing 2.01 and 1.91 carats, further accented by two baguette diamonds weighing...