Ross-Simons - Italian 1.5mm 18kt Gold Over Sterling Adjustable Rope Chain Necklace. This 1.5mm 18kt yellow gold over sterling silver rope chain is a great look on its own or paired with your favorite pendant. Adjusts from 24" to choker length by sliding the adjuster on the clasp. Made in Italy. Lobster clasp, 18kt gold over sterling adjustable rope chain necklace.