This necklace is awesome! It is heavy and will be sure to bring compliments. The necklace measures approx. 12 3/4" on the inside, about 1/4" thick and 3/4" wide at the Center and has a 2 5/8" opening. The necklace is marked but faint - reads "Taxco" "MEXICO". In excellent condition!! If you need additional information, please don't hesitate to contact me. Thanks so much for looking! We are listing other pieces of vintage jewelry - please visit our other auctions.