Lot 488. Diamond double clip brooch, Cartier, 1930s. Estimate 140,000 — 235,000 CHF. Lot sold 506,500 CHF. Photo: Sotheby's 2012

Composed of two shield-shaped clips set at the centre with a pear-shaped diamond weighing 7.23 carats and 6.57 carats respectively, highlighted with cushion-shaped, circular-, single-cut and baguette diamonds, each clip signed Cartier, Paris and numbered, French assay and maker's marks.

Accompanied by GIA report no. 1152020187 and no. 2155020234, stating that the 6.57 and 7.23 carat diamonds are both F Colour, SI2 and SI1 Clarity respectively.