This round blue sapphire and diamond necklace is 18 inches in length, made of 18K white gold, and weighs 3.7 DWT (approx. 5.75 grams). It contains 5 round blue sapphires weighing 5.08 CTTW and 12 round G color, VS2-SI1 clarity diamonds weighing 0.05 CTTW. The chain is adjustable.