A diamond ring. Photo Bonhams.

centering a cut-cornered rectangular-cut diamond, weighing 6.67 carats; enhanced by a circular-cut diamond 'X' motif basket and pavé-set diamond mount; signed Tiffany, Schlumberger; estimated total diamond weight: 2.20 carats; size 6 (partially obliterated signature). Sold for US$ 281,000 (€202,434)

Accompanied by GIA report #2155618715, dated August 20, 2013, stating the diamond as: D color, VVS2 clarity.

Bonhams. FINE JEWELLERY. 17 Oct 2013, New York - www.bonhams.com