Here's a link to a cool site that features extremely fascinating machined rings made of titanium and platinum and such.
I'm linking directly to the "contemporary" section instead of the home page because it has really cool designs to look at, but there are various other sections you might like to see.
I bought myself the most affordable one, the "Dome" design. There are so many others I would love to have, but hey, I'm of limited means.
risingtime.com