Gorgeous 14K Yellow Gold Ethiopian Opal Diamond Filigree Cocktail Ring. This great piece features one natural oval opal measuring 8 mm by 10 mm, and weighing 1.12 carats. The center stone is surrounded by numerous brilliant round diamonds totaling .45 carats. The ring is a size 7.5 and sizing is available for an additional charge. It weighs 3.5 grams.