Did anyone mention hematite yet?
That's the only one that even interests me really, but it's not a gemstone, it's iron oxide. ...like those shiny silver & white gold metals too.
As for rocks, I like turquoise a little...native american silver jewelry & so forth. On the precious side, sapphires (next to silver or white gold) are nice. I don't care for the bling like diamonds at all...too fucking tacky.
http://images.google.com/images?sour...te&sa=N&tab=wi