There are many characteristics beyond the 4Cs that are almost blind to the naked eye, especially for untrained people. Diamond Fluorescence is one of those features that can change the price slightly without reducing the diamonds overall quality. The effect of fluorescence depends on the colour grade in combination with the fluorescence grade (none, faint, medium, strong, very strong) of the diamond. Fluorescence can have a positive impact on some type of diamonds or a negative one that could affect its clarity and even make it look milky or cloudy. In order to combine the characteristics perfectly, it is very important to work with an advisor you trust.