This is a pre 1948 treasure made of carved obsidian in the oldest form of hand cutting to the stones. All stones are different in size and shape and the necklace length is 16in. It is hallmarked "SILVER MEXICO". The chain is large scale with the links being 7/8ths x 1/4in. The drop is composed of 7/8in. squares. It is magnificent with the weight being 90.5 grams. I love to see the quality of workmanship that this piece displays. Fabulous, LOOK AT THAT NECKLACE!