C&T Designs started carrying square copper and sterling last year. I was familiar with square wire as a wire-wrapper, because it's best for setting cabochons in the square wire + half round wire style I use for a lot of my wraps (it anchors the binding wraps better than round wire does). But when I got the square copper for chainmaille I fell in love, because the flat surface catches and reflects light in a way that reminds me of a diamond-cut metal. Of course, copper and sterling, while I love them both, tarnish and require a little more care than other metals do (See the Guarantee/Lifetime Care page).
So this last time I ordered, I was even more thrilled to discover that they are now making square wire in anodized aluminum. This is very limited availability in colors, but I'm sure the suppliers will be expanding the color selection. I currently have the violet and aqua in one size ring (suitable for Byzantine, which is the woven bracelet shown here), and also sky blue, red and champagne in a larger diameter ring (works great for Persian weaves, and several others that I haven't tried with it yet).
Square wire presents some challenges. Chainmaille weaves depend on the aspect ratio of the ring, which is the comparison of the inner diameter of the ring versus the diameter of the wire. A bigger ring works for weaves like Half Persian, European 6 in 1, and the large rings in a Dragonscale weave. A medium aspect ratio of about 4 works for byzantine, European 4 in 1, etc. And some weaves, such as Jens Pind Linkage, require a very specific aspect ratio or they won't work.
When you're working with square wire you can't use the diameter of the wire measured from side to side to figure out what ring you need, because the corners make a much tighter fit. I'm still experimenting with this.
I am also curious to see how the square wire affects the wear pattern on aluminum... it may be that the sharp edges are kind of rough on the anodized finish and you may get some color wear. This needs testing, but be aware. It will likely be less noticeable with lighter colors, which is why I haven't bought any black square until I see how it holds up.
But! You can expect to see some new chainmaille items with this really beautiful wire. It's especially lovely in my favorite weave, Half Persian 4 in 1, because the rings stack like this ///// so that diamond cut effect is a graduation of angled rings. You really kind of have to see it in person to know what I'm talking about.
For now, though, you can check out the Sporty Collection of Bracelets... new square wire aluminum rings will be showing up there as I play with this new product and see what it can do.