Very nice looking pen. I just ordered a bunch of crushed Opal while it was on sale and want to try the same technique. Did you put a small "groove" in the blank, fill it with your glue and turquoise then sand it smooth? Just asking as I have no idea how I'm going to do my in-letting. Thanks for sharing.
I don't mean to hijack the OP, but I'll offer some thoughts.
When I do the inlays with bought material (Turquoise in my case), I use several sieves with different size openings to get different size material (e.g., small, medium, large). I used several cheap kitchen strainers from a Dollar Store. After separating the material by size, it was much easier to do the inlay (a small slot with my parting tool, or in the case of this picture - natural inclusions in a Jarrah Blank.), Large first, medium, small, apply CA. It did fine for me, but others may have better suggestions.