A diamond ring, by JAR. Photo Christie's Image Ltd 2013

Centering upon a collet-set cushion-shaped diamond, weighing approximately 15.50 carats, the base of the gallery enhanced by a silver line of graduated single-cut diamonds, ring size 2¾, with French assay mark for gold, in pink leather JAR case. Signed JAR Paris. Estimate: $422,368 – $633,551

Christie's. MAGNIFICENT JEWELS. 12 November 2013; Geneva - www.christie's.com