I purchased these as an element of a costume, wearing only one of the two earrings.  To their credit, many people who knew me well gasped in surprise that I'd had an ear pierced, which I take to mean that the earring appeared genuine enough.  I am glad not to have had a larger size, as even the 5mm is large enough to suggest being CZ rather than real.

The magnet works well, but it is strong.  The earring began to annoy me after about 3 or 3.5 hours of wear, and I was glad to take it off at the end of the evening.

Still, it served it's purpose well and was inexpensive enough.