Jay Flex Sterling Vintage Rhinestone NecklaceJay Flex Sterling Vintage Rhinestone Necklace 1940's 1950's Stamped Jay Flex Jewelry Company began in Montreal, Canada in the early 1930's and they produced jewelry until the mid 1960's. Jay Flex was renowned for the quality of their designs and workmanship. Many of their pieces were adorned with high quality rhinestones and were usually executed on sterling as a base metal, whereas other designers at that time were using cheaper metals such as brass,