Are Descent gems fixed for each class?

If so, anyone have a link that shows who gets what? It would be nice to plan a little in advance. I got extremely lucky to find fire trap on my ranger right off the bat, and I don't know if I'll ever be able to play a ranger again knowing that I might not have that opportunity again.

The content of all Curious chests are fixed as well as the provions chest where you start. However, the content depends on your class.

GGG have on purpose not revealed anything (only given hints) to the content. It is up to us as a community (or by yourself) to find out what is in which chests for the different classes. The more you play (or watch others play), the more you learn, and the better knowledge you have when you plan out which way you want to go.