More from So Expensive Amethyst is one of the most abundant crystals in the world, but the most prized pieces can cost almost a million dollars. Some of the world's largest amethyst geodes come ...

Here’s a look at some of the most expensive gemstones in the world. Topping the list is the Pink Star Diamond, a 59.6-carat oval-cut pink diamond that shattered records when it sold for $71.2 ...