JOTW Sterling Silver Starfish Pendant an 18 Inch Box Chain Necklace (OT-XKVR-RWRA) This 1mm necklace measures 18 inches. This pendant measures 1.25 inch from left to right and 1 inch from top to bottom. This Sterling Silver pendant with necklace weighs approximately 6.55 grams. High Quality 925 Sterling Silver Jewelry!