Yellow sapphire and diamond pendent necklace. Photo Sotheby's.

The detachable pendant set with an oval yellow sapphire weighing 28.78 carats, suspended from a necklace decorated with pear-shaped and brilliant-cut diamonds, length approximately 430mm, Swiss maker's mark. Estimation 36,000 — 55,000 CHF

Accompanied by Gübelin report no. 14030278, stating that the yellow sapphire is of Ceylon origin, with no indications of heating.

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 13 mai 2014 - http://www.sothebys.com/