Choker: Wraps closely around the neck. Chokers are a great choice for high-necked tops or dresses. 
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Collar: Sits around the base of the collarbone. This necklace matches any outfit and nearly every neckline.
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Princess: Falls below the collarbone just below the throat. A popular choice that suits crew and high necklines as well as contrasting low plunging necklines.
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Y Necklace:  Sits above the bust. Suits plunging necklines. 
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Rope: Hangs below the bust just above the waist line.