Because de-Beers controlled a significant portion of diamond production and sales, the de Beers organization of South Africa was perceived as a monopoly.
An international firm called De-Beers Group is focused on the mining, exploitation, retail, trading, and production of industrial diamonds. The company engages in large-scale, open-pit soil and coastal mining. Mining is done in Botswana, Namibia, South Africa, Canada, and Australia, among the 35 nations where it works.
Further it renowned as one of the major manufacturer & seller of diamonds which restricts competitors from producing the diamonds often referred to a monopoly.
A monopoly has the authority to determine prices and restricts competitors' access to the market. A single seller who has total control over an item or service constitutes a monopoly in a market structure.
Thus De-Beers can be consider as monopoly.
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