1 carat from the worst quality to the best, about 4w-40w.
A diamond with the same grade of 20 1 is several hundred euros more expensive than a diamond without 20 1.
Ps The only Kauste diamond processing factory in the Netherlands has the patented technology of Royal 20 1 cutting. Only his family and another Dutch diamond processing factory have the best quality diamonds in the world (domestic first-class diamonds are second-class in their place)