Our Surface necklace is available in three different adjustable lengths: 16.0 - 18.0", 18.0 - 20.0", or 20.0 - 22.0". The model is wearing the most popular 18-20" length at the longest setting. The pendant piece measures 1.1/2" by 3/4". Materials: 14k gold, 14k gold-fill (14k gold over brass core/no nickel) and sterling silver (.925). All