A fancy colored diamond and diamond ring, Bulgari. Photo courtesy Bonhams

set with a rectangular cut-cornered brilliant-cut fancy intense yellow diamond, weighing 21.07 carats, flanked by triangular brilliant-cut diamonds, weighing 3.52 carats total;signed Bvlgari, with signed box; mounted in eighteen karat gold; size 4 1/4, (with sizing beads). Estimate: $550,000-750,000 (€430,000 - 590,000)

Accompanied by GIA report #10609514, dated January 10, 2013, stating the central diamond as: natural fancy intense yellow, VS1 clarity.

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