What looks like all rings in the center, is only real rings on the upper 2. The rest are chains. They are just joined at the base to look like rings. That way the outer small rings could be added.
The beads hanging off the bottom were strung on the thread before tatting, and are dangling from a picot. The others are slipped over a very long picot before joining.
The larger bead near the top was strung on the thread and joined at the opposite side. This put a thread from each shuttle alongside the bead. Then a lock join was tied at the top of the bead.
The main rings (chains) of the center are somewhat elongated and distorted from the stitch count and the placement of the picots. But I still think it's attractive...what is your opinion?