Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Must Contain Nickel

I'm highly allergic to nickel, it's my only allergy so I bought this item since it was supposed to be a sterling silver thing to connect it to the chain. It must have had nickel since I had a severe reaction to them with a short while of wearing it. Also their necklace chains caused severe reaction as well.Other than the nickel problem it is a very beautiful necklace and very pretty in the sun, would highly recommend if you have no nickel problem.