Vintage Sterling Silver Mother-of-Pearl & Marcasite Necklace Shop » Silver Jewellery » Vintage Sterling Silver Mother-of-Pearl & Marcasite Necklace Vintage Sterling Silver Mother-of-Pearl & Marcasite Necklace Solid and smooth, graduated design! $195.00 1 The necklace measures approximately 17″ 42.5 cm) in length, has a fold over clasp, and weighs a total of 30.6 grams.