I bought this for my 7 year old daughter. It's a nice set of 25 gemstones, but unfortunately the guide on the back doesn't tell you what each one is! It's a general guide only giving examples of what may be in the box. I'm also not sure that each gemstone is different (it looks like a couple of them may be the same type of stone but it's impossible to tell). We took a book out from the library to help us identify them, and my daughter likes them so overall we are happy.