I am exceedingly sensitive to nickel. And unfortunately it's not uncommon for a lot of "nickel free" jewelryto use a tiny bit of nickel in the clasp to help strengthen it. It's not an issue for most people, I guess, since no one but me seems bothered by it. Now, I won't dispute this company's claim head on, but the clasp on this necklace makes the back of my neck itch.  :(  Fortunately it's not too bad. I don't wear it every day. It's starts to bother me after 2-3 days in a row wearing it (though not sleeping in it). However, I'm afraid of how it will be in the summer and I sweat more, which increases the allergic reaction to nickel.

Other than that I love it! It's very pretty and suits the small pendant I bought it for perfectly. The twisted effect makes it shimmer at any angle. It's surprisingly durable. You'd never know by how it feels, but this thing is tough. My little boys have pulled on it (on purpose and on accident) and my 9 month old tugs at it, though I don't let her pull as hard as she can. I'm actually surprised it can take so much abuse!

I would definitely recommend this, but be warned if you're very much allergic to nickel.

UPDATE: Not sure why, but the itching stopped after a couple of months. Went through all of summer, sweat and all, without a problem. I've never had this happen with jewelry before - usually the sensitivity gets worse, not better. But I won't complain! I have upped my review to 5 stars.

UPDATE #2: It broke after a year. I can't say my kids didn't have anything to do with it, but I also don't recall any particular instance where too much tension was put on it. But one night I hung it up on a necklace hook, and the next morning the ring you clip the clasp onto had separated from the chain and the necklace was in a pile on my dresser. Sad.