Colour or more correctly, absence of colour is a very important factor in diamond grading. Most diamonds are graded on a whiteness or absence of colour scale. The colours that may decrease the value or rarity of a diamond range from yellow and brown to silver and grey. Basically, a whiter or clearer colour indicates a more rare diamond and correlates with an increased look of pureness and beauty.
Please note that diamonds come in all colours of the rainbow. Coloured diamonds are known as fancy diamonds and are graded on their intensity of colour, not lack of. Please see below to learn about pink diamonds.
Below are the foremost colour grading scales ranged together. They are Gemological Institute of America (GIA), American Gem Society (AGS) and French authority, Confederation International de la Bijouterie, Joaillerie, Orfevrierie des Diamantes, Perles et Pierres (CIBJO) which translates to International Confederation of Jewellery, Silverware, Diamonds and Stones.
Diamond Colour Grading Scales
Pink Diamond Colour Types
Pink diamonds are one of the world’s best kept secrets and are available in a range of stunning hues and intensities ranging from a very intense purplish pink through to a bluish pink champagne. Pink diamonds are so rare that only a handful of people will have the pleasure of wearing them in their lives.
The Australian Argyle Diamond Mine has devised a scale to describe the intensity of colour in a pink diamonds. The scale ranges from 1 - 8 with one being the most intense colour and eight being the faintest colour.
The 1 – 8 grading is then given an additional grade according to each individual diamond hue.
Pink Diamonds Hue
In order of rarity:
- PP - Purplish Pink
- P - Pink
- PR - Pink Rose
- PC - Pink Champagne.
Intensity of Pink Diamonds
- Very intense
- Medium Light
- Very Light
Argyle pink champagne diamonds are a beautiful mixture of elegant champagne with whimsical pinks. Pink champagne diamonds are graded and valued according to the intensity of champagne hue.
- PC1 - Pink and light champagne (C1 and C2)
- PC2 - Pink and medium champagne (C3 and C4)
- PC3 - Pink and dark champagne (C5, C6 and C7)
The cause of pink colour in diamonds is largely unknown and is the topic of ongoing debate amongst experts. This mysterious phenomenon only adds to their appeal and rare, inimitable beauty. It is thought that pink diamonds may obtain their colour as a result of pressure under the Earth's surface. Some experts believe that extreme geological force placed on a stone after its formation alters it structure, causing it to absorb light and gain its pink colour.