The "JOY" hallmark is a highly collectible vintage signature associated with Lester Bernard (under the renowned mid-century manufacturer Les Bernard). Pieces signed simply with "JOY" are celebrated by costume jewelry collectors for their creative, artistic flair.The Style & ValueDesign Period: This distinct stylized look dates back to the 1960s to 1970s MOD era.The Technique: The translucent, glass-like sails are crafted using a poured resin plique-à-jour technique, which was a signature style of the JOY brand to mimic stained glass windows.