China's $50 Diamonds Just Killed a $80 Billion Monopoly

China's $50 diamonds just did what nobody thought possible: they cracked an $80 billion monopoly that ruled engagement rings for over a century. For a hundred years we were told diamonds were rare. Factories in one Chinese province are now growing real diamonds by the truckload, and the company that sold the world on rarity is up for sale. In this video I trace how De Beers built its grip on the trade, starting with Cecil Rhodes and a four-word slogan that reshaped weddings everywhere. Then I look at what happened when lab-grown stones got cheap enough to change what couples actually buy, and why the price tag now attached to De Beers is so startling. There's also a strange twist in how the old giant tried to fight back, and a buyer from its own past waiting in the wings. If there's a ring in your jewelry box, this one is worth your time. What is that stone really worth now, and does the shop price you'd pay today match the factory price? The answer isn't as simple as the headlines make it sound. Diamond prices, retail markups and the details of the De Beers sale vary by country and are changing fast, so check current figures where you live. Tell me in the comments: would you propose with a lab-grown diamond? And subscribe if you want updates as the De Beers deal is decided. Sources: • National Jeweler — Anglo reportedly selects Gareth Penny's consortium as top bidder for De Beers • Rapaport (reporting Bloomberg) — Anglo picks Gareth Penny-led consortium as top De Beers bidder • JCK — De Beers second half 2026 coverage • Ecofin Agency — Anglo American takes fresh $2.3 billion hit on De Beers ahead of 2026 sale • De Beers Group — Interim financial results for 2026 • DiamondWorld — Diamond prices hit two-decade low as lab-grown supply reshapes market • Association of Intelligent Diamond International (AIDI) — China's lab-grown diamond jewelry market after the price collapse and consumer trust crisis • Made-in-China.com — Henan Grace Jewelry supplier listing • JCK — Lab-grown wholesale price freefall • KVIA / Stacker (BriteCo report) — Lab-grown diamonds reach 51% of new engagement rings in 2026 • Forbes — De Beers to close Lightbox, its lab-grown diamond jewelry brand • Bloomberg — Trump's tariffs and China's luxury slowdown pile pressure on diamond industry • bne IntelliNews — Botswana weighs bigger De Beers stake as due diligence on Anglo diamond sale winds up • NYU Stern (Luís Cabral teaching notes) — De Beers case study • The Drum — De Beers 'A Diamond Is Forever' campaign and the modern engagement ring #LabGrownDiamonds #DeBeers #China #Diamonds #EngagementRing #DiamondIndustry #Monopoly #AngloAmerican #Botswana #CReports