It's done in Lizbeth color 122, Caribbean. I love this thread- it's got all my favorite colors in it. The main body of the bookmark is size 20; the lock-stitch chain and single motif are in size 40. I've never understood why, if you make the same motif in a thread half the size, the motif is not half the size. In this case, the single motif is 3cm across, and each section of the bookmark is 3.5cm. Curious.
I think I need to borrow Jane's brain cell #3. She, of course, uses it to create her ingenious patterns and invent new tatting techniques. I need it just to follow a pattern. I kept having to re-open rings because I apparently can't count to 4. And remember where I left off last time I showed this bookmark? I worked two more sections of it, and then had to cut ALL THE WAY BACK TO WHERE I WAS BEFORE because I had forgotten to join every single one of the chains. Can you see where I joined on the new threads? Jon's diagram is perfectly clear and easy to read. I just didn't pay attention.