A 17.61 carats Burma type "royal blue" sapphire and diamond ring. Estimate US$ 200,000 - 300,000 (€180,000 - 280,000). Photo: Bonhams.

centering a cushion mixed-cut sapphire, weighing 17.61 carats, within a circular-cut diamond spray surround; estimated total diamond weight: 2.75 carats; mounted in white gold; size: 6 3/4

Accompanied by AGL report #CS 58531, dated January 15, 2014, stating the sapphire as: Burma (Mayanmar) origin, no evidence of heat.

Accompanied by AGL report #CS 58531-1, dated January 15, 2014, stating the sapphire as: Burma (Mayanmar) origin, no evidence of heat.

Accompanied by GRS report #GRS2013-100090, dated October 2, 2013, stating: natural sapphire, Burma (Mayanmar) origin, no indications of thermal treatment, vivid blue (GRS type "royal blue").

Bonhams. FINE JEWELLERY, 15 Apr 2015 14:00 EDT - NEW YORK