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Unique Colours Causes in Pink Diamonds
The unique colours in diamonds are caused by different trace minerals. Depending on the origin of the stones, certain minerals are more present – therefore increasing the presence of specific colours.
In Yellow Diamonds, the colour is caused by large amounts of Nitrogen. For Blue Diamonds, the colour is caused by Boron. Purple or Violet Diamonds get their colours from increased Hydrogen while Green Diamonds appear green due to exposure to atomic radiation.
The cause of the Pink Diamond colour still remains a mystery. Scientific evidence has shown that Pink Diamonds contain high pressure graining which results in a compressed internal structure and that is thought to be the origin of the colour. Within the industry, this is referred to as ‘Plastic Deformation,’ which occurs during the crystal growth.
As a result of the increased pressure, it is extremely difficult to find an Argyle Pink diamond with a high clarity grade. In fact, most Natural Pink Diamonds often contain pink internal graining lines or surface graining lines within the stone’s structure. The average clarity grade of an Argyle pink diamond is I1.