This large size pendant is marked 18k and is solid white gold. It weighs 15.2 grams and measures 2 1/8" x 3/4". Set in the center is a purple pear shape natural amethyst with an approx weight of 38.5 cts. The amethyst pendant has 70 round brilliant cut SI3 round natural diamonds with an approx total weight of .75 cts. There is a nice size loop at the top to accommodate a chain.