Ernest Oppenheimer wrote the diamond industry's quiet rule in a private memo: the only way to raise a diamond's value is to make it scarce — meaning deliberately reduce how many reach the market

Ernest Oppenheimer
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Mining giant founded by South African billionaire Oppenheimer, to sell Australian coal mines to UK miner for $3.9bn
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Maria A. Oppenheimer Obituary (2025) - Central Islip, NY - Affordable Cremation Services of New York
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Daniel Ernest Oppenheimer Obituary (2025) - Memphis, TN - Canale Funeral Directors
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OPPENHEIMER, 77, MINING KING, DEAD; South African Pioneer in Diamonds and Gold Was Made a Knight in 1921