De Beers' History Engagement Ring Origins - BAUNAT
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The History of De Beers and Diamonds
The Nature of Monopoly
PPT - De Beers : A Monopoly in the Diamond Industry PowerPoint
De Beers Posts Lowest Profit Since End of Diamond Monopoly - Bloomberg
Kitco Commentary
The Engagement Ring Story: How De Beers Created a Multi-Billion
WHY A DIAMOND CARTEL IS FOREVER - The New York Times
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Is De Beers still a monopoly?
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De Beers - Monopoly Broken Australian Diamond Portfolio