Working to imitate solid gold, the company used an unusually thick layer of 14-18k gold foil which formed the jewelry to withstand long term wear. It can sometimes be mistaken for and acid tests as real gold. The French became known for this superior quality laminated gold filled jewelry into the early 1900s and the company used only the best Art Nouveau designers of the time including Emile Dropsy, Louis Brochu and Edmond-Henri Becker.