I find it interesting the Neiman Marcus has a Luxury section of their website (isn't that the whole site???) but they do have some amazing pieces in their. I don't usually look at the jewelry sections, but I wanted to see what was new in ring designs.
I really like this quartz ring from the "power ring" collection. It is a Diane vonFurstenberg by H. Stern ring and it has great modern lines but is very classic looking as well.
Swarovski also has some great crystal chunky rings like this that are around $200.