A 9.15 carats diamond single-stone ring. Estimate £150,000 - 200,000 (€210,000 - 270,000). Photo: Bonhams.

The brilliant-cut diamond, weighing 9.15 carats 

Accompanied by a report from GIA stating that the diamond is H colour, VS1 clarity. Report number 5171085392, dated 20 March 2015

BONHAM'S. FINE JEWELLERY, 22 Apr 2015 14:00 BST -LONDON, NEW BOND STREET