Take My Money, Tourmaline
When I was in college, I used to study Geology, which focuses mainly on the materials that make up the Earth, the features and structures in it, as well as the processes that act upon it. One of the many good things it did to me was it exposed me to the many beautiful minerals under the ground.
Indeed, the diamond looks pretty, but there are a lot of other cooler minerals, too. Who knew I would ever be so in love with garnet, amethyst, and tourmaline? Speaking of the latter mineral, have you ever seen a 72-carat tourmaline? It looks more incredible in person than it looks in the picture. Take my money, I want this one!