Lady's 18K Yellow and White Gold Opal, Emerald, and Diamond Ring. Set with an 8x6 milimeter channel set cabochon cut white opal; two 3.0 milimeter round bead set emeralds; sixteen 2.0 milimeter round brilliant cut diamonds Total diamond weight: 1/2 carat. Ring weighs 8.5 grams. Finger Size 6-1/2.