Whenever creating a new necklace, I like to let the individual style of the developing piece dictate the length. Some larger pendants are solo stars best on a long chain, while other clusters of concentrated color and shape sit pretty at the base of the neck.

There is a guide of common lengths to keep in mind during the process though. In my illustration here, the shortest 14" and 16" are commonly closest to being a choker. Various lengths hit the front of the body either above or below the bust-line, none absolutely at the apex so the necklace can sit properly on the wearer.