Our Jewelry Association has access to the top Jewelry Manufacturers in the US. Connect with our Members & Explore their products and collections. Established in 1983 by a small group of distinguished jewelry manufacturers in the USA, The Plumb Club has become one of the leading go-to supplier organizations for jewelry suppliers. Today, The Plumb Club is a unique coalition of leading, responsible and important suppliers spanning all facets of the jewelry, diamond and watch industries. The Plumb Club’s membership accounts for a significant percentage of the domestic fine jewelry market.