
I've put the necklace last night in the tumbler and it shines now so nicely :)
Before putting it in the tumbler, I checked first about the hardness of rhodonite, as some stones (like turquoise, or pearls) do not fare well in the tumbler for a long time (say longer than 15 minutes, others nothing at all). But rhodonite has a hardness of 5.5 to 6, so I though 'all is well', as they say it's safe to tumble any stone with a hardness of at least 5.5. And safe it was, indeed :)
Here is a good place to check for the Moh's hardness of your semiprecious (or precious) stones if you're not sure you can tumble polish them or not.
