This measures approx. 3½" made with #10 thread. Easy one to do. To make the picots near all same size, I measured by holding by index finger next to the ds made and measured from first joint of finger to tip of nail.

 

R 2ds -- 1ds -- 1ds -- 1ds -- 1ds -- 2ds cl rw

Ch 10ds -- 10ds  (This picot does not have to be as large as the rest, just large enough to join each chain to center.)

R as before Rw

Ch 10ds + ( to picot on first chain made)

Continue around for 6 rings, attach last chain to first.