Oh i'm not offended or anything, just wanted to point out the miss type dwarf and dwarves can be used interchangeably since tokin used both in his books and people take that as gospel. Not saying that people with the condition don't use one over the other.
As for diversity you could honestly give them as much diversity as we have in humans, it all depends on how you handle the culture of them. Normally dwarf would be seen to live underground which would pretty much mean no black dwarfs because of how skin pigment works (darker skin to stop damage from large amount of UVR, being underground with little to no UVR would end up mutating pigment to be junk cells that the body would evolve to not give any resources). But if you have the culture just living above ground, even doing a dragon age surficer dwarfs so there is a dwarf population above ground that easily can give as much diversity as you get in humans just with a limit in height.
(this last sentence is off but its 4am and my brain is mush and i cant work out what to edit about it right now)