What does the Church say about wearing the rosary as a necklace?

What does the Church say about wearing the rosary as a necklace? A protestant friend of mine came back from a trip with a rosary hanging around her neck, and i was wondering what the teaching is.
thank you.

The following link should assist you in better understanding the appropriateness of wearing a rosary. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
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