Oh, and by way of "rating" the Thalia rings. The quality is fantastic. I've got 8 of them now and am having fun mixing/matching. No complaints. I've read that the gold plating will not be as durable as the unplated Tungsten carbide. For that matter, no metal is.
The gold plate looks best to me with the contrast with carbon fibre. Absolutely spectacular. I also like the gold plate with the koa. The gold with the blue abalone is some serious bling if you're into that. It's a little much for me. If I rock the abalone, I wear it alone.
The unplated TC is exquisite with koa, but perhaps too muted when paired with CF. I didn't get any unplated rings with the blue abalone, but I'll bet that would work great.
For the record, I've never been a jewelry person, but these rings are inexpensive and obviously I'm digging the new look.