This black and white rock chain necklace is made of fine sterling silver, plated with rhodium, and stamped with a "925" quality mark. This necklace measures 20 inch in length and 1.6mm in width, secured with a lobster claw clasp, weighs 3.2 gram. This necklace is nickel free and hypoallergenic. Brand: BERRICLE Design: Novelty Style: Chains Occasion: Valentine's Day Resizable: No Adjustable: No Metal Stamp: .925 Sterling Silver Gift Box: Gift Box