What is a Bar Necklace? The Diamond Reserve Bar Necklace Womens Personalized Bar Necklace Engraved Necklace Custom Etsy Personalized Bar Necklace Custom Jewelry Personalized Etsy Custom Bar Necklace Silver Bar Necklace Personalised 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.