If you do not want to have any from of affliction to the evil eye or those who have envy eyes, then wearing a nazar protection amulet is the best choice to make. 
 
While there are many kinds of nazar, not all have the same value, heritage and quality. This one in particular was made and created by a craftman of authenticity in Turkey, however one of the main reason why I also took this one is that not only it is a real glass turkish nazar, but it is also silver plated. And if you do not know, silver is a crucial item if you want to protect yourself not only from negative energy and forces but at times, from the devil itself. 
 
For reference, it is in 16 inches neck sizes from neck to chest. I try not to get things that are too long as the purpose of these things are to be seen by people as it is useless when they are not seen. However if you are inclined, you always have the freedom and choice to change your own chains.