This ring was made in the late 1930s and marked 10k. It is solid white gold and weighs 6.4 grams. It also has a crown hallmark. The widest part of the ring at the top is 1/2". It has a tapered black onyx piece with no chips or scratches. Set in the center of the onyx is a round 3.2 mm European cut natural diamond with an approx weight of .12 cts. The diamond is VS 2 AND H Color. The ring wears to a size 8.75 and can be resized.