Antonio Pineda's design says one thing, ELEGANCE. This is part of his crescent onyx designs with each crescent going from clam shell to clam shell that drapes beautifully and with great comfort in the wearing of this masterpiece. The diameter is 5 inches across and because of the design this is the best form of measurement for wearable length. It is at least 16in. The weight is 63 grams and the condition is outstanding. The bracelet shown is listed on my site and is also made by Antonio Pineda. This necklace will take your breath away! Just, LOOK AT THAT NECKLACE!