There has this fear or some sort of awkward feeling when you hear the words skull and evil eye. It might refer to the darker side or being evil, as everybody perceived it to be. However, this notion is all created in the mind. It is just people are making these meanings or relationship between these words to being evil or just plain and simple evil. The mind has its capability to make this fear with these words even if they are harmless. A word, in simple parlance is just group of letters put together. It is the mind that has created meanings with a certain word. 

When you read skull, which pertains to death and evil eye, pertains to evil, then what these words might do to you when you read them? Nothing! These are all words, but to give it a twist turn these words associated with certain objects or items, now these words have symbols. Does it convey being harmful? Still it does not. These are just things mere products of the hands of man and nothing is harmful to that. There are some people who have the guts to wear these so-called symbols as fashion accessories. They were normal and no harm was done to them.
The skull jewelry and evil eye jewelry are the designs of fashion accessories that teenagers wear or some expressive individuals. Skull earrings and skull rings are few of the items that we rarely see but when we see a person wearing a certain judgment will pop up into our minds. An instant judgment to the person, he might be evil or weird.

These fashion accessories have nothing to do with being evil or in the dark side. A man is evil because of the circumstances in his life that leads him to be one not because he is wearing a skull jewelry or evil eye jewelry.