This long double square necklace is adjustable, and can be worn between 28.3/4" and 30". The larger rounded square pendant piece measures approximately 1.5/16". The smaller piece tucks neatly within, and measures approximately 1.3/16". Materials: 14k gold-fill (14k gold over brass core/no nickel) and sterling silver (.925). All materials are hypoallergenic. This necklace was designed in San Francisco and is handmade in our Upstate New York production studio.