"In fact, this 2.05 carat vivid yellow diamond exhibits the highest level of colour saturation that I have ever measured in a natural 'pure' yellow diamond...'
'.... In the mind of the collector, strength of color in yellow diamonds begins at the point where the human eye is able to detect a very slight tinge of (faint) yellow, and extends through a gradually increasing scale of highly saturated (vivid) yellow colours. At the highest end of this saturation scale, certain vivid yellow diamonds may appear to mimic the color and intensity of nature's most vivid yellow objects, such as daffodil yellow, sunflower yellow and canary yellow....
Hence, many diamond merchants, as well as diamond collectors, are in a perpetual state of searching for the so-called 'ultimate' yellow diamond, what many diamondaires refer to as a 'super-canary' color. Such a gem possesses a breathtaking combination of purity of yellow hue, and an unusual strength of color saturation, similar to the bright yellow feathers of the Harz Roller breed of canary bird.....
The present stone .... is a true contender for this high place of honor among natural yellow diamonds. When measured with a colorimeter, the hue is within the normal tolerance accorded to pure yellow diamonds, and the saturation is very strong. In fact, this 2.05 carat vivid yellow diamond exhibits the highest level of color saturation that I have ever measured in a natural 'pure' yellow diamond....'
Stephen Hofer, author of 'Collecting and Classifying Coloured Diamonds'