In 1966, Botswana had 12 kilometres of paved road, 22 university graduates, and virtually nothing else. Sixty years later, it is an upper-middle-income country with GDP per capita exceeding South Africa's — $7,800 versus $6,600 — and a development record that contradicts the dominant narrative of postcolonial African failure. The transformation is real, measurable, and earned through institutional choices that most resource-rich states never made. The core mechanism was simple but vanishingly rare: Botswana captured diamond revenue through state ownership (50 percent of Debswana, the De Beers joint venture), parked surpluses in a sovereign wealth fund (the Pula Fund), maintained foreign reserves covering 7.5 months of imports, and systematically converted mineral income into public goods rather than elite consumption. Poverty fell from 30.6 percent to 14.5 percent between 2003 and 2022. Electricity access reached 80.2 percent. The country launched Africa's first free comprehensive HIV treatment programme in 2002 and became the first high-burden country to achieve WHO Gold Tier status for eliminating mother-to-child transmission — bringing transmission down to 1.2 percent. The contrast with peer states is brutal. In the DRC, rich in copper and cobalt, 85.3 percent live below $3 a day. In Zambia, copper-dominant, the figure is 71.7 percent. In oil-rich Nigeria, 41.8 percent. Botswana's record is not a story about diamonds being uniquely beneficial — it is a story about institutional design determining whether mineral wealth builds nations or hollows them out. Political stability reinforced the economic model. The Botswana Democratic Party governed for 58 consecutive years, but when voters chose the opposition Umbrella for Democratic Change in 2024, the outgoing government handed over power peacefully. Democratic transfer without crisis is the institutional capstone: the system survives regime change because it was built around rules, not individuals. The vulnerability is stark and immediate. Diamonds still account for nearly 90 percent of goods exports, a third of national revenue, and three-quarters of foreign exchange earnings. Laboratory-grown stones are undercutting natural diamond prices. The economy contracted 2.8 percent in 2024 and another 0.7 percent in 2025. Unemployment sits at 21 percent overall and 28.9 percent among 15-to-35-year-olds. Botswana avoided the resource curse but never escaped resource dependence. The diversification portfolio is credible but early-stage. Internet access reached 68.9 percent of households by 2024, yet ICT accounts for only 2 percent of employment. Tourism provides 50,500 jobs — 6.7 percent of employment — built on a conservation estate covering 40 percent of national land. A 500MW solar plant with 500MWh of battery storage under construction at Maun could anchor new industries. But more than 95 percent of private-sector sales remain domestic and only 9 percent of firms export. The institutions that turned diamonds into development now face a harder test: building an export economy from scratch before the diamond revenue window closes. Botswana's 2025 agreement with De Beers — giving the state-owned Okavango Diamond Company 30 percent of Debswana production, rising to 40 percent after 2030 and potentially 50 percent — buys time by capturing more value per stone. But processing and polishing diamonds is still diamond dependence. The real question at 60 is whether six decades of accumulated human capital, institutional trust, and infrastructure can generate a post-diamond economy before the market forces it.