46 cm Necklace
A shorter length that falls around the base of the neck for men and at the collarbone for women.
51 cm Necklace
This length will fall right at the collarbone for men and a few inches below the collarbone for women.
61 cm Necklace
Falls below any neckline.
69 cm Necklace
Extra-long and falls at or just below the bust for women and below the sternum for men.
String or Paper Method
Tape Measure Method