American Gemstone Authority, LLC (USA) was formed in 2006 as a contract jewelry manufacturer specialized in gold and silver j ... ewelry using natural gemstones. It has since grown into one of the leading contract manufacturers in the jewelry business; walking customers through product design and prototyping through to finished branded production items. Intellectually property is strictly upheld, and molds, masters, and the products thereof all remain property of clients returnable on demand. read more