T he Okavango Blue Diamond, a dazzling 20.46-carat stone, is more than just a beautiful jewel-it's practically a miracle of nature. Unearthed from the Orapa mine in Botswana, this rare gem has ...

This is because the two elements share similar weights and properties. "The diamonds can range from clear to very deep blue," Martoia said. "The more boron, the deeper the blue." She added that it ...