Large Art Deco Style Sterling Silver Marcasite & Onyx Necklace. This is an incredible and substantial piece of jewellery. It comes on its original sterling silver 16.0 inch chain with a 1.5 inch extender. It is fully hallmarked on the T-bar for with "925", anchor for Birmingham, "DK" and the date letter ."h" It contains 20.13 grams of sterling silver. Excellent new condition. Comes with its certificate of authenticity. It comes in a new luxury case.