Here's my attempt. I kinda went overboard on the "Add a little chaos to it" but it turned out nice. I also tweaked the end results a little bit. And I think this tutorial would make a neat (Un-cut) gem with a few adjustments.
Edit: Here are those "adjustments" (Really just Brightness around minimum, contrast around maximum, and a few sharpens, and of course different color tint);
Ruby This one is with sharpen +,
Emerald this one is with plain sharpen.