Black Silk Cord Chain Necklace with Sterling Silver Clasp - 18" One of our most popular chains, this simple classic black silk cord necklace is perfect for all of your favorite pendants. The sterling silver lobster clasp holds your jewelry securely. Our customers love this product because the silk cord feels great on your skin and lies smoothly for a classic and timeless look. a Necklace measures approximately 16 inches in length and the silk cord is approximately 2 millimeters in width. The delicate sterling silver cap accommodates most pendants.