Personalized Bar Necklace Double Layered Bar Necklace Etsy Custom Engraved Bar Necklace Elegant Personalized Jewelry in Silver Signature T Bar Necklace Bar necklace, Gold bar necklace, Stunning Gold Bar Necklace Custom Bar Necklace Personalized Bar Etsy. 16" with clasp and extender Gold Filled Gold filled is a great choice for those not willing to sacrifice their poolside accessories. Each gold filled piece is made by bonding the gold to the metal underneath (for us that is brass or sterling silver). Gold filled pieces can stand up to regular encounters with water, perfumes and oils. While the piece may darken over time, they will not turn to reveal another color underneath.