The DTC sorts , values and sells approximately 75 % of the world 's rough diamonds by value .
The Diamond Trading Company ( DTC ) is the rough diamond sales and distribution arm of the De Beers Family of Companies .
The DTC sorts , values and sells approximately 75 % of the world 's rough diamonds by value .
The Diamond Trading Company ( DTC ) is the rough diamond sales and distribution arm of the De Beers Family of Companies .