I included the .asl, the .pat, and seamless image tiles (300 x 300 .pngs) for non PS Users. There are some shimmery metals and some rusty metals.
And then I found a cool filter in Filter Forge that makes gems. It is really neat because you can adjust the number of sides, the number of facets, the color, the lighting. It takes awhile to render the images but it is worth the wait! There are 6 greyscale gems and their colored examples included in this set. All are about 3" in diameter in .png form. Have fun playing with the blend modes, fill with gradients, they are very versatile. I used a dark green to lighter green linear gradient on this gem in overlay mode:
Cool eh? Grab them below!