Amuse Foosh brooches have a magnet on the back, with a second magnet that goes inside your clothing to keep the brooch in place. This prevents snags and pin holes that can be caused by regular pin-back brooches. But since you can wear these so many different ways, maybe brooch isn’t the best term for them?
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Since it is a magnet, you could even use it on your refrigerator. So maybe we should call them Pieces of Flair? Suggest a name in the comments. If your suggestion is selected, you will win a free brooch!