Gem-Craft corp. Providence/Cranston RI, USA. 1945 to present day. Mark on this piece is most likely from 1979. Founded by Gene and Alfeo Verri just after WW2, with the Craft mark coming later. they took over the Jewelcraft mark in 2006 from Coro whom Gene worked for for over 30 years. Also made jewellery for Kenneth J Lane, Kramer, Cadoro, Capri and R Mandle