This shiny 18K yellow gold filled box chain necklace is 16 + 2 extender (18 in total) inches long and fastens with a lobster clasp. The chain is approximately 1.5 mm wide. This necklace is tarnish-resistant and hypoallergenic. It does not flake off, tarnish or discolor. *** Free Velvet Gift Pouch Included. We have 18K Rose Gold/18K White Gold in stock for this model.