Wash the rocks, then tumble them in your vibratory tumbler. I have an Ultra-Vibe 18 tumbler into which I put 5 lbs. I let the tumbler run for 6 hours. After 20 hours of running time, the rocks had smoother edges and their colors were more defined, but they still looked like rocks. If you want the stone to look wet, polish it with Zam.
Rocks usually have a deeper color once they are polished.
You can either polish your stone or leave it looking more natural. Making the bezel and bail. The rock will be suspended from this bezel and will be visible from both sides. Solder the bezel using hard solder. A friend taught me a great method for soldering bezels, and it has never failed me.