Description
For anyone tracking the US–China tech war: China's lab-grown diamonds crashed the gem market — and captured the synthetic diamond that cools every advanced AI chip on Earth.
Inside: how a 100-year diamond cartel collapsed, why China's 1963 industrial-diamond program suddenly matters, and the 29 days in autumn 2025 when Beijing showed the world it could shut off a supply the entire AI arms race depends on.
⏱ CHAPTERS
00:00 The Two Diamonds You Can't Tell Apart
00:31 The Crash Everyone Watched — And Why It's a Decoy
01:27 How De Beers Faked Scarcity for 100 Years
02:56 The 90% Collapse That Killed the Cartel
04:19 The Chili County Growing Half the World's Diamonds
05:46 The "Something Bigger" — The Rock That Cools AI Chips
07:08 The 29-Day Kill Switch
08:31 The Real Playbook: Rare Earths, Gallium, Graphite
09:08 What You Were Never Meant to Notice
📌 THE KEY FACTS
• A 1-carat lab-grown diamond fell from ~$4,000 wholesale a decade ago to under $200 today — a 90%+ collapse.
• Lab-grown went from 1% of diamond sales to a 52% majority of US engagement rings by 2024.
• De Beers posted a $511M underlying loss; parent Anglo American wrote it down by $2.3B — the third straight year — and now wants out.
• China produces over 90% of the world's synthetic diamond and ~95% of industrial output; more than 80% sits in Henan.
• A synthetic diamond conducts heat ~5x better than copper and 13x better than silicon — while staying an electrical insulator. That makes it a heat spreader for the same class of chips the AI race is built on.
• On Oct 9, 2025, China's Commerce Ministry issued Announcement 55: export controls on industrial synthetic diamond and the machines that grow it — pointedly excluding decorative jewelry. After the Xi–Trump meeting in Busan, the controls were suspended on Nov 7, 2025 for exactly one year, through Nov 10, 2026. Not withdrawn — paused, with a clock running.
🔎 PRIMARY SOURCES
• China MOFCOM/GAC Announcement No. 55 (2025) and the Nov 2025 suspension notice
• De Beers & Anglo American FY2025 annual results
• N.W. Ayer "A Diamond Is Forever" (1947) advertising history
• Industry data on lab-grown price and market share (2015–2024)
• Published specs on diamond thermal conductivity and semiconductor heat-spreader use
📷 IMAGE CREDIT
Xi Jinping portrait by Press Service of the President of Russia / Roman Kubanskiy, via Wikimedia Commons, licensed under CC BY 4.0.
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