The large silver rounded square in the pendant is approx. 1.5/16″ across, and the smaller gold rounded square is approx. 1.3/16″ across. The chain length is adjustable and can be worn 28.3/4″ to 30.0″ length. Materials: 14k gold-fill (14k gold over brass core/no nickel) and sterling silver (.925). All materials are hypoallergenic. This necklace is handmade in our California and New York production studios.