I was quite surprised when I was first told about people being allergic to certain metals. I had never heard of such a thing but it is more common than you might think. It means that they may have to avoid certain metals and search out the right material which will not affect them. There are several inexpensive  metals that will interact with the skin and may cause a green or black ring on the skin under where the ring or necklace touches the skin.

Most people have no problems and they can wear anything they want but anyone choosing a wedding ring should check that their skin will not react to that type of material. Gold is expensive but does not normally cause any reaction or discomfort so the traditional gold wedding rings are always a good choice for rings.