A sapphire and diamond ring. Photo Christie's Image Ltd 2014.

Set with an octagonal-cut sapphire, weighing approximately 20.20 carats. to the baguette-cut diamond shoulders and bifurcated hoop, mounted in gold, ring size 6½. Estimate CHF40,000 – CHF50,000 ($45,622 - $57,027)

Accompanied by report no. 14030004 dated 4 March 2014 from the Gübelin GemLab stating that the sapphire is a natural sapphire, with indications of heating, and an Information Sheet on Basaltic sapphires.

Christie's. GENEVA MAGNIFICENT JEWELS, 14 May 2014, Geneva - http://www.christies.com/