J.E. Caldwell was a prestigious American jewelry retailer with a long history of working with renowned designers and creating exceptional jewelry pieces. Collaborating with Oscar Heyman, known for their exceptional craftsmanship and attention to detail, would result in a truly exquisite and valuable necklace. Such a piece would likely be highly sought after by collectors and enthusiasts due to its historical significance and the reputations of both Oscar Heyman and J.E. Caldwell in the jewelry industry. Signed and numbered