12 – 15″ / 30 – 36cm – Tightly around the neck
15 – 17″ / 38 – 44cm – On the collarbone
18 – 20″ / 46 – 51cm – Between the collarbone & the bust
20 – 22″ / 51 – 56cm – From top of bust to slightly below
Necklaces sizing