Bits of technique: split rings with beads in between (diamond shape)

I am normally not too much into the theory, but because I want to post here a pattern (the dragofly), I really need to make this intermezzo.
Remember this set?

The middle part is just rings with the pearl ont he thread. This is not interesting me now. What I need are those split rings with the beads disposed as diamond in between. 

Long story short: it is a 2 shuttle project, CTM is perfect. You have to string beads on both the shuttles. Shuttle 1 will have, as a proportion, 3 times more beads as Shuttle 2. All the ds given are just for the sake of the demonstration. In the diagramms the beads have 2 different colours just to show from which of the shuttles are coming the beads. 

Shuttle1 : start ring with 1 bead in the loop: 16 close. The bead will stay on the core thread at the closing point of the ring. 

Shuttle 1: take 3 beads. 1 bead will come next to the ring, make loop with the other 2, work the first half of the SR (8ds). Lower 1 bead from the loop at the base of the ring, keep it in place. Take Shuttle 2, bring from this shuttle 1 bead at the ring, start the second half of the ring (8 ds). You should see the diamond formed. Close ring. The remaining bead from the loop will be the base of the next diamond. 

I needed to make this small tutorial for the tail of the dragonfly. Otherwise, that blog entry would have been a monster one. 

Have fun tatting. I know you will.