I am working with a parcel of Afghan bi-color tourmalines that are very nice colors but quite a few inclusions. When using 8000 the “swarf” is sucking up into the inclusion and making the inclusion black. I have Soaked in acetone, but without making much of a dent in getting it out. I have considered purchasing an ultrasonic jewelry cleaner, but don’t want to waste money if anyone has experience otherwise.Have had this difficulty with beryl as well.
RKC