Design: Formed up the left and down the right by 19 rings connected by chain lines, joined at side picots, and bridged across the center with dc.
Ring: 2ds, p, 3ds, 3(p, 2ds), ds, p, 2ds

-For Rings, single 1st loop on hook serves as first half of the first ds.
-When making a joining to a picot, the picot loop serves as the 1st half of the next double hitch stitch (ds).

Working from base of the bookmark up the left side:
Begin with normal starting loop on the hook, which serves as first half of the ds.
Make ring. Make chain line.

In remaining rings:
At point of 1st picot on current ring, create joining to previous ring by inserting hook from back to front (to prevent twising of the work) through the last picot of previous ring.

Continue until you have made 11 rings separated by 10 chain lines.

Keeping the work flat, bend the 10th and 11th rings around so that you will now be working back down the edge of the rings already made.

Continue along in this manner until you have made an bridge into the 1st ring made.
Chain 25 for tail of Bookmark.