Sterling Blue Topaz Scrolled Snake Chain Necklace

Beautiful artisan necklace Sterling silver with pointed/faceted blue topaz cabochon The pendant is 10x14 mm. The snake chain is 16 inches long and about 2 mm wide with a toggle clasp Choker length, should sit above the collar bone Signed on the back, fantastic quality, but I was unfortunately not able to identify the maker The metal has been tested with an electronic metal analyzer and the stone tested with the presidium gem tester