What the subject wants to ask is "What grade is De Beers?" ? Top grade As a top brand in the diamond industry, De Beers was founded in 1888 and participated in the formulation of the 4C standard that is still in use today. It is called the master of the Diamond Foundation, and all the jewels made for the British royal family are collected in the Tower of London. It is the only top brand in the world that focuses on diamond production.