As a matter of fact, being a rogue, you would most likely have the dexterity that is required in intricately cutting a jewel. Poor Scherzo does it, and he posessed the grace and agility of a pregnant cow, so I know you can do it.
That's one great thing about this game: craft-wise, anyone can be anything. So go nuts. Sure, some crafts might be a little harder to start than others, but there's nothing stopping ya.
Happy crafting.