Necklace sizes are determined by the styles of Necklaces
Choker (14-16 inches)
It sits around the base of the neck and fits snugly. Very important to measure the circumference of your neck to determine how loose or tight chokers will fit you.
Princess (18-20 inches)
This falls just below the throat at the collar bone.
Matinee (22-23 inches)
This falls a few inches below the collar bone at the cleavage.
Opera (30-35 inches)
This falls at the breast bone.
Rope (over 35 inches)
Falls all the way through your upper torso.