Collar ( 12" to 13" )
Worn tight and high up on the neck. Typically mutli-strand
Choker ( 14" to 16" )
Worn tight around the neck, but lower down just above the collar bone. Typical single strand
Princess ( 17" to 19" )
Worn just below the collar bone. Great with pendants. Most popular length.
Matinee (20" to 24" )
Worn down to the breast bone. Versatile for casual or business
Opera ( 25" to 34" )
Worn in many ways, for dramatic effect. Can be simplified by double loop around neck for more elegant look
Rope ( 35" – 45" )
Worn in various ways, usually knotted in front or multiple loops around neck. Also worn as a multi-strand bracelet
Lariat ( over 45" )
Worn with multiple knots in front or multiple loop around the neck, or a combination
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source from : okajewelry