Neptune Giftware Pewter Pendant On Adjustable Black Cord Necklace. A beautiful necklace with a pewter pendant. The black cord necklace is fully adjustable from 40 - 80 cm (16 - 32 inches), so can be worn as long or as short as you like. The pendant is made of fine pewter, is nickel free and measures approximately 2 x 3.5 cm.