Magnificent 18K White Gold Oval Solitaire Diamond Engagement Ring Band. 18K white gold diamond engagement ring. This gorgeous piece features one brilliant oval white 1 carat diamond ans 48 brilliant round diamonds, totaling 2.55 carats and 12 marquise diamonds, totaling 1.35 carats. The ring weighs 11.3 grams. It is a size 7.5. Sizing is available.