Unfortunately, the beautiful earth-grown diamond my husband bought for me eight years ago had lost some of its value. Back then, he scrimped and saved by cutting costs.

So, how are diamonds made? For generations, people have been captivated by diamonds, known as “the king of gemstones,” and ...

A beautiful blue flaw in a gem-quality diamond from Botswana is actually a tiny fragment of Earth’s deep interior—and it suggests our planet’s mantle contains oceans’ worth of water.. The ...