A diamond solitaire ring, Harry Winston. Photo courtesy Bonhams

the pear-shaped diamond, weighing 7.04 carats, flanked by tapered diamond baguettes; signed Winston for Harry Winston, with signed box; mounted in platinum; size 4 1/4. Estimate US$ 250,000 - 350,000 (€200,000 - 270,000)

Accompanied by GIA report #2155204025, dated January 15, 2013, stating the central diamond as D color, VS1 clarity. 

Bonhams. 15 Apr 2013. New York. A Prominent Private Collection of Fine Jewelry