(All measurements refer to Outside Diameter, O.D.)

For this weave I used 5mm and 7mm rings, and they seemed to work perfectly. I think you could also use the 6mm and 8mm rings. I worked with 20 gauge rings.  Try experimenting with other sizes and gauges!

Step 1. Start with a large ring and add 2 smaller rings. Then add 2 more small rings, 1 small ring, 2 small rings, 2 more small rings and a large ring.

Step 2. This is the tricky part. You are going to add 1 large ring by passing through both sets of small rings attached to the large rings. It isn't as hard as it sounds, and once you get the first one, the rest will be easier. As I have been playing with this weave, I have had problems with the small rings popping back through the large ring added in this step. I am making an expanded version, so I have been adding the 2 small connection rings to each of the large rings, which has been helping keep everything in place. If you're only making a single chain, you could add some small beads to each side of the large ring and this would also keep the rings in place.

This is what a chain of this weave will look like. 

To expand this weave vertically, make 2 chains the same length. Lay them side by side and use 2 small rings to attach each of the large rings across. 

Here is a sample of the vertical expansion. I used 4mm rings for the connection rings. When I used the 5mm rings, it was pretty floppy. I also added some size 8/0 seed beads to the 7mm ring that weaves through the 5mm rings. By adding this bead, it keeps the 5mm rings from popping back up through the 7mm rings, therefore the rings keep their shape.

This is a helm/coda weave combo. I worked it the same way as the coda weave, but instead of weaving the 7mm ring through the 2 rings connected to each of the large rings, I just went around the center ring as in the helm weave. I also connected these 2 chains with 4mm rings and instead of lining up the rings to match each other, I alternated them.