What do the terms Top Wesselton, Wesselton, etc. mean?

The terms Top Wesselton, Wesselton,... refer to the old denominations of the colour of a diamond. Today, the colour of a diamond is indicated by gradations of whiteness which go from D to Z. Previously, the colour of a diamond was indicated by variations from Jager to Light Yellow. The old terms Top Wesselton and Wesselton respectively correspond with the new denominations G and H, that we offer. Below you will find an overview of the new and old names of the colour of a diamond. This model of colours is officially used by the IDC (International Diamond Council).