The most sought-after colour for a diamond is one where no colour is evident because it is the totally colourless diamond that acts as a prism allowing light to pass effortlessly through to be transformed into a rainbow of colours. Whilst the majority of gem diamonds appear to be colourless, others can contain increasing shades of yellow to brown, some of which are referred to as champagne diamonds. Other diamonds of exceptional colour, red, blue, pink and amber, are known as “Fancies”.
The colour grading scale varies from totally colourless to light colour or tinted.