As topic states.
either sell them, use them to craft trinkets (like rings, necklaces ect, when combined with gold or other metals they can make quite a profit) and heard about a quest that needs a certain type.
This and sometimes NPCs ask you favors to get them amethist, garnet , rubies etc.
It's too bad that we cannot decorate our armor and weapons with gemstones for a more personal look. If that could be added into the game with DLC that would be awesome.
[quote user="Echo Drive"]
You know it would just be a matter of time until someone crafted Liberace armor.
It's a good idea to hang onto any
kind of gems you find. Most of them bring in pretty profits, and if you use them to create rings, amulets or other such trinkets, it counts toward your crafting skill.