THE MEASUREMENTS OF THE CHAIN IS 4 MM X 20 INCHES. THIS OMEGA CHAIN HAS BEEN ASSAYED IN BIRMINGHAM ENGLAND. SO CARRIES THE SPONSERS MARK PLUS 925, THE SCALES AND THE ANCHOR, WHICH IS BIRMINGHAMS HALLMARK. THESE ARE VERY STRONG CHAINS FOR THE HEAVIER PENDANTS YOU WISH TO WEAR. This item is in the category "Jewelry & Watches\Fine Jewelry\Necklaces & Pendants".The seller is "tobrown65" and is located in this country: ES. This item can be shipped worldwide.