In most cases this is always a matter of personal preference. Some women love to wear their pendants on a 16-18″ chain and others prefer them longer.
I used to wear my pendant on a sterling silver choker which makes it easier to put on and take off but now I like a longer 24-30″” chain which also allows ease of removing without opening the clasp.
It is also a more modern look which is very popular now a days.
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