Sterling Silver necklace, 14kt yellow gold setting for genuine diamond. Handmade by Jaime Rubini, one of a kind. Chalcedony is 14mm diameter bezel set with a lightly hammered edge. Diamond weighs approximately .09ct 4 x 2mm. Chain is 1.5mm thick 18 inches long plus center, 20 inches overall. Silver has a sandblast finish. Clasp is spring ring style. 

Clean it with baking soda paste or a jewelry polishing cloth.