Can you cut a diamond into a prism that would make light into a rainbow?

I'm writing a story and I wanted to know if it's possible to cut a diamond into a prism that would make a rainbow.|||Yes, in fact jewelers do it every day. Next time you're at a jeweler take a classic cut diamond (the most common kind of cut) and take a look at it in the light, moving it back and forth. You'll see all different colors of the rainbow flashing from the stone. This is because the cut is designed to provide a prismatic difusion of light effect and is part of the reason diamonds are so popular in the first place.|||Yes you could do that. It would work just like a glass prism, except a lot more expensive.