I am a jeweler with over 20 years in the industry. My partner and I have personal ties with silversmiths in Bali Indonesia. These rings have been handmade by these craftsmen. Each one has a touch of uniqueness. The rings are 1.5mm thick and they are available in many different sizes and widths. Each is stamped .999 for pure Bali silver. Each ring comes with a certificate of authenticity and will be shipped in a hand made beaded bag from Bali (colors are chosen at random). These rings are great to make a fashion statement - or great as a substitute wedding band if you are traveling on vacation.