Platinum, 18 Karat Gold, 31.41 carats Burmese Ruby and 31.25 carats Diamond Necklace and Ring, David Webb. Estimate 350,000 — 450,000 USD. Lot sold 430,000 USD. Photo Sotheby's

The necklace set at the front with five oval-shaped and cushion-cut rubies weighing 31.41 carats, framed and accented by round diamonds weighing approximately 31.25 carats, internal circumference 15½ inches, signed David Webb; together with a ring of similar design, centered by a cushion-cut ruby weighing 5.30 carats, accented by round diamonds weighing approximately 6.65 carats, size 6, signed David Webb.

Accompanied by two AGL reports:

No. CS 69946/1-5 stating that the five rubies in the necklace are of Burmese origin, with indications of heating.

No. CS 69945 stating that the ruby in the ring is of Burmese origin, with indications of heating. 

Sotheby's. Magnificent Jewels New York | 09 Dec 2015.