12 inches = 30cm "Collar"
Collars are usually made up of three or more strands and lie snugly on the middle of the neck. Very Victorian and luxurious, collars go best with elegant V-neck, boat neck or off the shoulder fashions.
16 inches = 40cm "Choker"
A choker is perhaps the most classic and yet versatile of all the single strand lengths. A simple choker can go with virtually any outfit from casual to fancy evening wear, and just about any neckline imaginable.
18 inches = 45cm "Princess"
The princess length necklace is best suited for crew and high necklines. It also complements low plunging necklines.
Hint : it is a perfect support for a pendant.
20 inches = 50cm to 24 inches = 60cm "Matinee"
Longer than the choker, and just a bit shorter than an opera length, the matinee necklace is the right choice for casual or business dressing.
28 inches = 70cm to 32 inches = 80cm "Opera"
The opera necklace is the queen of all the lengths. When worn as a single strand, it is refined and perfect for high or crew necklines. When doubled upon itself, it serves as a versatile two strand choker.
Over 45 inches = 112cm "Rope" or "Lariat"
Clasped in strategic locations around the necklace will enable you to break it down into multi-strand necklace and bracelet combinations.
Lariats are at last 48 inches long, with the ends left unattached for knotting or wrapping around the neck.