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See the comments of the article:

http://www.iamdann.com/2012/03/21/my-magnet-implant-body-mod...

Where's a good place to get magnetic rings for this purpose? I searched Amazon and found things like magnetic bracelets marketed as alternative medicine to cure you. None of the reviews I found mentioned using them as an electromagnetic sensor, so I can't tell if they're useful for the purpose.

I found a friend who's had magnet rings; he pointed me to some info: http://hackaday.com/2012/01/02/give-yourself-a-sixth-sense-o... (follow the links; it links to "Holy Scrap" blog which links to a couple online magnetic-ring-sellers).

I also found a ring sizing guide: http://pages.ebay.com/buy/guides/ring-sizing-guide/

There should be a difference in sensation because of the difference in mass of the ring versus implant. An implant, simply because it is so much smaller, should have a stronger reaction, should move or vibrate more, for a given strength of field.