"Diamond Pacific Vibra-dry media with 50,000 diamond grit. It doesn't hurt
stones, even nice opals"
Anything that comes in contact with this abrassive diamant media will be
effected .... no doubt about it!.
It might be that you don't see it with the naked eye but especially opals
wil be worn off by this media.
Even sapphire and emeralds will loose some of the fine edge between two
Diamond abbrasive media will effect anything which is softer then diamond,
If you use polishing times of 20 up to 30 minutes with this media, you'll
better keep an eye on soft stones.
Objects with stones are best polished manually to my opinion.