This is tatted in DMC Cordonnet Special size 100 white. It's my first time using such a small thread, but it's a lot easier than I expected. DMC is very smooth so all of the rings glide closed effortlessly. My size 15 mini crochet hook works really well for joining very small picots.
So far, the doily measures 4 inches across. Here is another photo for an idea of it's size:
I honestly thought it would turn out smaller than this. It's too bad DMC stopped producing size 150. I wonder what that would have looked like...
Jan Stawasz didn't name this pattern, so I'm copying Elena's idea of the "Mega Project" and will be calling this the "Mega Doily." I'm rather uncertain if I will be able to finish such a large project, but I will give it my best shot!