This fashionable authentic long necklace is by David Yurman, crafted from black and white sterling silver featuring 4 black box link chain with 4 white box link chain divided into 5 sections. Between each section is a 3 curb link station, the center curb link has the cable design. The necklace secures with a large cable lobster clasp and it is signed D.Y 925Material: black and white sterling silverMeasurement: 42" long x 0.53" wide Curb link station: 1.04" long x 0.42" wide x 0.17" highWeight: 138.7 grams