Important Antique Enamel Locket Necklace For Sale at 1stDibs Navy Enamel Vermeil Round Locket with Blue Sapphire Round locket Gold and Enamel French Antique Locket Necklace at 1stDibs enamel Navy Necklace Etsy. Monica Rich Kosann blue enamel locket necklace features a 17" Black Steel Chain, with a loop at 16" for adjustability and a complimentary 18 Blue Cord. This locket holds two images. Images easily push into the inside of the locket. Locket measures approximately 3 4" in Diameter Chain Length: 17" (loop at 16") or 18 Blue Cord. Locket Made in Thailand, Steel Chain made in Germany 18K Yellow Gold over Sterling Silver and Blue Enamel