"Paragon (diamond)
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A paragon is a perfect diamond — flawless and without inclusions. In the 16th century, a weight of 12 carats was sufficient for this title but now, more than 99 carats are needed.[1]
The largest flawless diamond in the world is known as The Paragon — a D-class gem weighing 137.82 carats"
Although I realise that you can't always trust Wikipedia.