3.2 Flourescence

3.2.1. Determination of fluorescence

In the same way as for the colour grades, the fluorescence grade is assessed by comparison to fluorescence-reference-diamonds. This is done under a lighting of UV-rays, wavelength 366 nm.

3.2.2. Grading of fluorescence

The fluorescence grades are:
nil - slight - medium - strong
The colour of the fluorescence is not mentioned on a certificate.