I have finished this doily in Omega size 50, it measures 9in/22 cm. The last row did not add to the size. I was quite skeptical of the thread but it was not difficult to tat with as long as you are not a tight tatter.
The colorway is interesting and for photographing, I tried a few backgrounds as suggested and settled on white.
This is from the book by Jan Stawasz Tatted Treasures , which is full of a wide variety of tatted patterns. I thought the central part of this pattern would work for a clock face and perhaps it will.