An Emerald and Onyx 'Panthère' Ring, By Cartier. Photo Christie's Image Ltd 2013

The polished gold coiled band with a panther head terminal, accented by pear-shaped emerald eyes and onyx nose, mounted in 18k gold, ring size 7, with French assay mark for gold, in red leather Cartier case. Estimate HK$30,000 – HK$50,000

Signed and with maker's mark for Cartier, No. 691350

Accompanied by a certificate of authenticity from Cartier 

Christie's. HONG KONG MAGNIFICENT JEWELS. 28 May 2013. Convention Hall