I purchased this for my husband. He loved it and received many compliments, but after one week's wear, it turned his wrist green.  Not just a hint here and there, very noticeable, to the point I was embarrassed wondering how many people saw it before he noticed (nice cheap watch your wife bought you, is what ran thru my mind, lol).  He doesn't believe it's the metal, but the black insert.  Very dissapointed considering this wasn't a $20 watch - would not recommend purchase.