Important ruby, turquoise and diamond necklace. Photo Sotheby's

Composed of four graduated strands of ruby beads, the floral clasp set with cabochon rubies, polished turquoise and circular-cut diamonds, length of shortest row approximately 650mm. Estimate:  470,000 – 750,000 CHF

Accompanied by Gübelin report no. 13020145, stating that in excess of 90% of the six hundred and forty three ruby beads were tested at random and found to be of Burmese origin, with no indications of heating.

Sotheby's. Magnificent Jewels and Noble Jewels. Genève | 14 mai 2013, www.sothebys.com