Simply a fantastic product. If you EVER wanted to make gemstones a part of your treasure hoard, use this, please. Gives you the knowledge of a mineralologist as a DM. tell your players EXACTLY what the gem is worth and what it is, what it looks like, what color variant it has, how rare it is, the cut (or not). Simply put, I learned more about gem stones in this book, than I ever would have thought possible. Again, fantastic product.
[5 of 5 Stars!]