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The quality and value of a diamond is judged on four fundamental criteria
known as the four C’s. The carat-weight, colour, clarity and cut.
Some differences in quality are easily noticeable, others need specialist
equipment and qualified graders with years of experience to assess and
detect. Accurate assessment of a diamond is only possible prior to being
set. Once the stone is set even a trained grader cannot precisely determine
colour, size and purity. Therefore quality and value can only be estimated.
Minor differences in colour, clarity and weight can have a major effect
on value. For this reason, laboratories only grade loose diamonds.
In addition to the four C’s, laboratories test for treatments,
which enhance the colour and clarity of the diamond. Treatments such as
fracture filling, laser drilling and high temperature high pressure, significantly
reduce the value of the diamond and should be disclosed.
To find out more about each of the "4 C's" use the submenu to the top
right.
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