An Emerald, Pearl and Diamond Ring, by JAR . Photo: Christie's Images Ltd 2012

Set with an oval-shaped emerald, to the pearl and diamond gallery and hoop, mounted in platinum, 1988, ring size 3¾. Estimate CHF460,000 - CHF650,000 ($504,993 - $713,577)

Accompanied by report no. 61997 dated 6 February 2012 from the SSEF Swiss Gemmological Institute stating that the emerald is of Colombian origin, with moderate amount of oil

Literature JAR, Exhibition at Somerset House, London, November 2002 to January 2003, no.320