As promised, here's my finished Shimmer shrug as modeled by me. (DH just came into the room so I showed him this picture. He commented that I cut off part of my head to which I replied, "That's because I hadn't dyed my hair yet and I had a nice section of grey roots that I didn't want to show." Cropping is a wonderful tool.)
My sleeves were 3/4 length---that is, until I washed them and then they became short, long sleeves. I used 2 1/2 skeins of Red Heart Soft in black which....grows when it gets washed.
Or maybe the back got stretched out. Either way, it wasn't quite what I wanted. But it was fun to do, especially the back.
I have to wear this with a black shirt, so the diamonds probably get lost. But I know that they're there. I've worn it several times to work and am really liking it. If I had to do it over, though, I'd use Cascade 220.