A sapphire and diamond ring, circa 1920. Photo: Bonhams.

The central cushion-shaped sapphire within a scalloped border, pierced and millegrain-set with old brilliant and single-cut diamonds and calibré-cut sapphire detail, mounted in platinum, sapphire approximately 5.70 carats, later hoop, ring size S½. Estimate £8,000 - 10,000 (€9,600 - 12,000)

Bonhams. FINE JEWELLERY, 30 Apr 2014, London, New Bond Street -www.bonhams.com