Diamonds, De Beers, and the Death of Artificial Scarcity | A CFO Explains Diamonds

In this episode of Run the Numbers, CJ Gustafson breaks down the diamond industry as a business model: how De Beers controlled supply, engineered demand, and built one of the most powerful pricing machines in history. From the Central Selling Organization to “A Diamond Is Forever” to the rise of lab-grown diamonds, this episode unpacks monopolies, scarcity, pricing power, and what happens when technology forces transparency.—SPONSORS:RightRev is an automated revenue recognition platform built for teams that have outgrown spreadsheets and billing tool workarounds. It handles high-volume subscriptions, usage-based contracts, and mid-cycle upgrades, so you can scale without scrambling at month-end. For RevRec that keeps your books clean, visit https://www.rightrev.com/CJRillet is an AI-native ERP built for modern finance teams that want to replace NetSuite and close faster. With revenue recognition, close management, multi-entity support, and native Stripe and Salesforce integrations, Rillet helps scaling companies run their finance stack in one place. Hundreds of teams, including Windsurf and Mercor, use Rillet to make the zero-day close real. Book a demo at https://www.rillet.com/cjEY works with high-growth tech companies to navigate the messy realities of scaling—from regulatory requirements to IPO readiness. By helping teams get it right early and often, EY lets founders stay focused on building while reducing risk as they grow. Learn more at https://www.ey.com/techstartupsSpendHound is a SaaS spend management platform built for finance and procurement teams that want visibility and leverage in every deal. By tracking all your software, benchmarking pricing across thousands of vendors, and surfacing contracts and renewals, SpendHound helps you stop overpaying and negotiate with confidence. Trusted by teams at ZoomInfo and Hootsuite. Get started at https://www.spendhound.com/cjBrex is an intelligent finance platform that combines corporate cards, built-in expense management, and AI agents to eliminate manual finance work. By automating expense reviews and reconciliations, Brex gives CFOs more time for the high-impact work that drives growth. Join 35,000+ companies like Anthropic, Coinbase, and DoorDash at https://www.brex.com/metricsAleph is a modern FP&A platform built for teams that want more than another planning tool. By connecting your ERP, CRM, and other systems into one trusted data layer with AI workflows, Aleph helps you move faster with real-time insights. Get a personalized demo at https://www.getaleph.com/run—LINKS: Mostly Talent: https://mostlymetrics.typeform.com/to/cLTxtAsNCJ: https://www.linkedin.com/in/cj-gustafson-13140948/Mostly metrics: https://www.mostlymetrics.com—RELATED EPISODES:Why Uber Drivers Can’t Escape the 30% Cuthttps://youtu.be/LpbH9GpBrSY—TIMESTAMPS:All verified. Here are the timestamps:0:00 Blood Diamond1:55 Show intro2:15 Diamond history: ancient India and riverbed origins3:56 Brazil supply shock and the mining era4:39 De Beers: Cecil Rhodes and the PE rollup6:47 Sponsors — RightRev | Rillet | EY9:49 The Central Selling Organization (CSO)10:39 The site system: invite-only, take-it-or-leave-it auctions12:22 Diamonds are more abundant than gold13:01 NW Ayer, Bernays, and engineering demand14:17 "A Diamond is Forever" campaign15:13 Lab grown diamonds: 20% of US purchases16:32 De Beers collapses: $3.1B operating loss17:18 Sponsors — SpendHound | Brex | Aleph21:07 Lesson 1: Rollups are powered by capital21:39 Lesson 2: Distribution beats mining22:11 Lesson 3: Artificial scarcity unravels22:55 Lesson 4: Price opacity is a temporary moat23:39 Lesson 5: Demand engineering24:30 Lesson 6: The real product was risk smoothing26:30 Credits#RunTheNumbersPodcast #BusinessStrategy #FinanceHistory #Pricing #Monopoly