1. Size and weight: length(perimeter) of the upper layer is 57cm which means the diameter is about 18cm, and the lower layer is 45cm, so the diameter is about 14cm, 18g 2. Material: made by alloy, very smooth so that you will feel comfortable when wearing it, but remove the chain before swimming or bathing 3. Sexy, pretty and novel design fit for most women and girls, excellent gift for Anniversaries, Brides, Wedding Party, Holiday, Graduations, Birthdays, valentine day, and etc.