This magnet comes out of a typical computer hard drive. It is VERY strong and handy to take along when shopping for jewelry or bullion. It won't catch non-ferrous (copper/brass) impurities, but it will catch the tiniest amount of iron in places where iron should not be.
It has a hole so you can hang it on a string to make it even more obvious when impurities or fakes are brought near.
The spoon in the pic is NOT included ... only there to show size.