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The initials T. W. probably represent the words total weight and always implies the collected carat weight of multiple diamonds.

If a document states that the TW is certified, someone with certification authority apparently weighed all the diamonds and determined that their total weight is [some number].

This may mean that a non-TW certified set of diamonds totals a weight that has not been similarly certified.

Tip: The most valid certificate for any diamond characteristic comes from a gemologist with certification credentials from GIA or EGL, which are the highest standards for gemstone certification.

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