|Only one in every 10,000 diamonds possesses natural colour. In mineralogy Diamonds are essentially carbon atoms which are arranged in a diamond or crystalline lattice. This unique formation of atoms does not absorb light, which results in the colourless appearance characteristic of a pure diamond.
But sometimes, impurities, such as Boron and Nitrogen can
actually get in..... this results in the Fancy Coloured Diamond.
Small amounts of impurities alter the way that light is absorbed into the diamond. For example, a blue diamond has traces of the element Boron and in a yellow diamond you will find Nitrogen. HOWEVER... Argyle blue or violet diamonds are not the result of boron impurities. Nickel or high concentrations of hydrogen are believed to be responsible for this amazing colouration
Green Diamonds gain their colour through exposure to radiation, and other coloured diamonds such as Australian Argyle Diamonds, have what is known as a "defect centre" where by one or more of the carbon atoms in the crystalline or diamond lattice may be missing resulting in a Champagne or Cognac diamond.
Red and Pink Diamonds however, are beyond rare. For many years, their unique colo
ur was a complete mystery as trace elements have never been found in them. Research now shows that the colour is caused by a distortion in the diamond's crystalline lattice. This distortion displaces many carbon atoms from their normal positions and alters the qualities of light that is reflected by the diamond resulting in the pink and red colouration.
The Australian Argyle Diamond Mine produces 95% of the worlds Pink Diamonds and it has been said that for every one million carats of diamond produced at the Mine, only one carat will be of a high pink colour. The life of the mine itself is also drawing to an end with diamond production estimated around 2020. It is for these reasons that Pink and Red Diamonds are so rare and in turn, so expensive.
All diamonds, regardless of colour, have a relatively high optical dispersion (ability to disperse light of different colours), which results in its bright sparkle. Excellent optical and mechanical properties, especially their unparalleled hardness and durability, make the diamond the most popular gemstone for engagement rings.
The Argyle Diamond Mine has colour guides available to indicate the various diamond hues that are found in the mine. From light Champanes to rich Cognac, Pink Rose`to Purplish Pinks, Violets and Blues... their hues are absolutely unique to Australia and their individuality is unsurpassed.
Each and every Argyle Diamond is unique... and so, the colour chart is only a representation of a range of colour - each diamond found will have a colour variation within its own category.