This necklace is made of 14K white gold and weighs 1.8 DWT (approx. 2.8 grams). It contains a halo of 49 single cut diamonds G-H color VS clarity weighing 0.12 CTTW accenting a round black onyx slab. The disc measures 5/8 inches in diameter white the necklace is 18 inches long with adjustments.