This is a very well made necklace that just slips on with twist and a gap in the back measuring 2in. The stone is absolutely STUNNING and it swivels for a perfect fit. The drop is 1.75 x 1in. It will fit at least a 16in. neck size. The weight is 55 grams of thick silver. Hallmarked with an eagle 3 and the initials RUA making it a vintage piece. Sometimes simplicity shines and it really does with this one. Just gorgeous, LOOK AT THAT NECKLACE!