You do not need to measure your neck for necklaces. They are designed to fit most of us, though you can always consider the length for the purpose of layering. You can sort the length of our necklaces according to the tags: Collar 30 cm / 12 inches Lies flat to the neck rather than hanging freely. Choker 40 cm / 16 inches Sitting closely around the neck. Princess 43-48 cm / 17-19 inches It will fall just below the throat and sit at the collarbone. Matinee 50-55 cm / 20-22 inches Will fall below the collarbone or sit at or above a low neckline.