Vintage sterling silver 925 Birks marcasite garnet 1940s chain necklace

Stunning, vintage sterling silver Birks garnet and marcasite 1940's necklace. This lovely piece has a wearable length of 17" long, the chain width is 1.5 mm wide and the garnet has a diameter of 8 mm. There is no missing marcasites. This piece is in amazing vintage condition with a nice patina to it. A nice clean hallmark on the back of the center piece, sterling Birks.