Frank Auerbach Head of E O W II 1964 Frank Auerbach courtesy Marlborough Fine Art

A belle époque diamond solitaire ring, circa 1915. Photo courtesy Bonhams.

the oval-shaped diamond, weighing 6.98 carats, within a delicate openwork mounting of single-cut diamonds; mounted in platinum; size 5 1/2. Sold for US$ 458,500 (€331,909)

Accompanied by GIA report #1142867326, dated July 30, 2012, stating the central diamond as: D color, VS1 clarity.

Bonhams. Fine Jewellery New York. 15 Oct 2012 -