This one-of-a-kind opal and diamond necklace is 18 inches in length, made of 18K yellow gold, and weighs 8.5 DWT (approx. 13.22 grams). It contains one circular, multi color opal weighing 6.28 CTTW, 30 mixed shape G color, VS clarity diamonds weighing 1.61 CTTW, 30 round diamonds , and 2 emerald cut, diamonds . The chain is adjustable.