|
|
|
Colour is a key aspect to be considered with when buying a diamond. Colour can be judged with the naked eye – a poor diamond can appear quite yellow. The Gemological Institute of America (GIA) set an alphabet scale as the colour- grading standard. The best and most expensive diamonds are rated D, and the lower quality diamonds are rated Z. Using the G.I.A. colour grading scale, the average colour grades are ‘H I J’ as underlined below.
D E F G H I J K L M N O P Q R S T U V W X Y Z Diamonds that are closer to the D end of the colour grading scale are more expensive, while diamonds that are closer to the Z end of the scale are less expensive. The Z colour is the same as a glass of iced tea, however the D colour as the same as a glass of perfectly clear water. |