Inside a secure laboratory in New York City geologist Evan Smith is peering into billion-year-old blue diamonds to gauge the inner workings of Planet Earth. The cold, dense objects zap the warmth from ...

Blue diamonds, among the rarest gems on Earth, are born deep inside the planet’s mantle. Yet their blue hue comes from boron, an element far more abundant in Earth’s crust than its mantle. Using tiny ...

Blue diamonds shine with a particular allure within the cultural zeitgeist. From Titanic’s fictional “Heart of the Ocean” to the real-life, possibly cursed Hope Diamond, these hued gems have captured ...

Most diamonds are made of carbon recycled over and over again between Earth’s surface and its crust. But diamonds with the deepest origins — such as the famed Hope Diamond — are made of carbon from a ...

Pink diamonds are some of the rarest gems you'll find on the planet. In fact, these diamonds are so rare that a single mine in Australia has been the source of almost 90 percent of the colored ...