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 ...

A 5.72-carat fancy intense blue diamond sold for more than $8.8 million, making it the top lot of a varied and successful Christie’s Magnificent Jewels auction held Tuesday in New York.