This black and white channel arc necklace is adjustable and measures 18.0" to 19.1/2" in length. The pendant piece measures 2.0" x 1/8" at its widest point and features three small diamonds. Materials: Sterling silver (.925), oxidized sterling silver, two 1.0mm and one 1.5mm lab-created diamonds. All materials are hypoallergenic. We hand carved and oxidized the channel where the diamonds are set. The oxidation is protected within the channel and is therefore better preserved over time. We love how the diamonds really pop against the oxidized channel. This necklace was designed in San Francisco and is handmade in our Upstate New York production studio.