What is fluorescence, and how does it affect a diamond?
Fluorescence is an emission of light from within a diamond and can occur naturally. To detect it a “black” or UV (ultraviolet) light must be used. Yellow fluorescence and in some cases strong blue fluorescence may make a diamond appear cloudy or milky, even under daylight. In “lower” colors (I and below) some blue fluorescence may help the diamond to appear whiter than it technically is. Fluorescence information is always available on the certificate.
