When we think of diamonds, we often think of love—of proposals, anniversaries, promises made beneath city lights or golden sunsets. But lately, the diamond's story has taken an unexpected turn. It’s not just nestled in velvet boxes anymore. It's boarding freight trains across Central Asia, being graded by algorithms in India, and sparking fintech innovations in Shanghai. This isn’t a love story anymore. It’s a story of reinvention—and the unlikely matchmaker is something as grand and sprawling as the Belt and Road Initiative. At first glance, linking a trillion-dollar geopolitical strategy with a shimmering stone seems like a stretch. But spend some time with the idea, and it starts to make perfect sense. Because what is a diamond, really, if not a product of pressure, time, and precise alignment? And what is the Belt and Road if not exactly that—an ambitious alignment of nations, markets, and futures? I met a diamond dealer once in Singapore, who told me that before the Belt a...