Here is the rewritten description within 400 characters, segmented for clarity: This is a separate sale item. Crafted entirely from solid 18k gold, not plated, ensuring lasting quality. Marked 18k G18K Au750 for purity assurance. Nickel-free, lead-free, and hypoallergenic, ideal for sensitive skin. It will not cause skin discoloration. Features a highly polished, shiny surface. The durable yet delicate extender chain lengthens necklaces, chokers, bracelets, or anklets. Perfect for year-round wear with any favorite jewelry. Available lengths: 1, 2, 3, 4, 5, 6 inches. Includes a secure lobster clasp for easy attachment and removal. Note the extension chain is small but strong, not suited for very thick chains. Please check style and length before purchase. Carefully packed in exquisite jewelry packaging, ready for gifting.