14-16" Necklace
Fits like a choker and can sit around the base of the neck like a collar.
18" Necklace
The most common length. Popular when a necklace has a pendant. Falls just below the throat at the collarbone.
20-22" Necklace
Falls a few inches below the collarbone. Perfect length for a lower neckline or if you want to wear a neck lace with a turtleneck sweater.
24" Necklace
Falls below any neckline.
30-36" Necklace
Falls below the bosom. This length can be worn as a single strand or doubled for a layered look.