This blue topaz and diamond necklace is 18 inches in length, made of 14K yellow gold, and weighs 1.4 DWT (approx. 2.18 grams). It contains 26 single cut cut, G color, VS2-SI1 clarity diamonds weighing 0.08 CTTW and one heart cut, london blue topaz weighing 1.15 CTTW. The chain is adjustable.