About five inches across
The elegance of this pattern astounded me once I came to understand the ebb and flow of it. It is indeed a fine artist who can conjure up a design like this.
The thread is Daiso, #40 from Wendy and it held up valiantly under very trying circumstances! A great, tightly-twisted, though 2-ply thread for tatting, in my opinion.
p.s. I have to thank Frivlole for bringing this pattern to my attention. As always, she inspires me, and by following that inspiration, I grow as a tatter.
Her wonderful rendition is here.