This lovely necklace has a sterling silver pendant signed TH-51. That usually means it is Taxco but it doesn't say Taxco. It is marked Mexico and 925. The pendant is about 1 inch across and 1 1/4 inch tall, including the bale. There is a square blue lapis lazuli stone in the pendant. The bale is like a cool tube across the top. It weighs 19.8 grams. The chain is marked 925, I don't know if the chain is the original chain but it matches pretty good.