I got this ring for my boyfriend, and he absolutely loved it. He has big hands, so the size of the ring was perfect for him. However, after wearing this ring for a couple of weeks, he began to develop a rash on his finger. He took the ring off for a couple of weeks thinking his finger just wasn't used to wearing a ring, but when he put it back on, the rash came back within a day. I don't know whether this Tungsten is bonded with Nickel or Cobalt. It could be the former and he is just allergic to it, but if it is the latter, Cobalt has a negative reaction with your skin overtime and causes oxidation spots. We'll have to look into it. It would be nice though, if the website specified which one it is.