Collar 12-13 inches
Pearl collars are usually comprised of three or more strands and fit snugly around the middle of the neck

Choker 14-16 inches
A pearl choker will rest along the collar bone.

Princess 17-19 inches
This is by far the most commom strand length, resting below the collar bone, upper mid-chest.

Matinée 20-25 inches
The matinée length rests just below shoulder height.

Opera 26-36 inches
An opera length necklace falls to the middle of the chest.

Rope 37 inches or more
A rope length necklace will fall to the waist, or longer, depending on the length of the strand.