Fluorescence - is it good or bad?
When exposed to invisible ultraviolet (UV) light, many diamonds temporarily luminesce, emitting visible light of different colors and different strengths. Known as Fluorescence, this is a property seen in a fairly large percentage of diamonds. Strengths and colors vary as do the impacts on appearance and value. Customers considering fluorescent diamonds, (especially in the higher strengths such as strong or very strong) should learn as much as possible about this property to make sure it is right for them.