This 14k gold or sterling silver diamond necklace is adjustable and measures 16.0" - 18.0" or 18.0" - 20.0" in length. The pendant piece features a 3.0mm diamond. Select your preferred length and metal choice from the dropdown menus. The pendant piece measures 4.0" in diameter, 7mm from the base of the pendant to the bail and is 3mm tall. Materials: 14k gold or sterling silver (.925) and a 3.0mm lab-created diamond. All materials are hypoallergenic. This necklace was designed with my Gram in mind in Asbury Park and is handmade in our Upstate New York production studio.