This necklace was featured in one of the beading or wire magazines several years ago; sorry - I can't be more specific than that - can't find the pattern anymore.
I was so crazy about this look that I cut more rings, and made a matching bracelet and earrings.
Then the trouble started - the crystals don't want to stay where you put them.
They stay for a little while, but then they start to slip out of their "cages", sliding into the unit below them (gravity-wise) - and the more time they have, the more they make their escape! They turn sideways just a tiny bit from the position they are supposed to maintain, and can actually slip through 5 or 6 cages in one move if the cages below them are already empty. (I actually watched it happen)
About a week after I made this necklace, I decided to wear it, and discovered that almost all of the crystals had slipped out of place. I tried to manipulate them back into position without deconstructing the rings, but that didn't work. Weird, because the little chainmaille cages obviously weren't the tight fit they purported to be.... but anyway.
I toyed with the idea of taking it apart and re-doing it, but figured it would probably just do the same thing again, so why bother? So I ended up just taking it apart, and recycling the rings and crystals into other projects.
I followed the patterns instructions exactly - same gauge, same ID (inner diameter) - not sure what the problem was. The crystals appeared to fit quite snugly into the little "cages" - and I really believe that if I had altered the AR (aspect ratio) at all, the cubes wouldn't have fit anymore.
Sigh ... I really loved this idea!