Ruby and diamond brooch, Van Cleef & Arpels, 1989. Photo Sotheby's

Designed as a flower, the petals composed of calibré-cut rubies en serti mystérieux, the centre set with a brilliant-cut diamond, the stem with baguette diamonds, signed Van Cleef & Arpels and numbered, French assay and maker’s marks, case by Van Cleef & Arpels. Estimate:  57,000 – 75,000 CHF

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