This one-of-a-kind oval blue sapphire and diamond halo necklace is 18 inches in length, made of 18K white gold, and weighs 3.9 DWT (approx. 6.07 grams). It contains one oval cut, blue sapphire weighing 2.02 CT and 12 round G color, VS clarity diamonds weighing 0.68 CTTW. The chain is adjustable.