I looove my ultrasonic. I bought mine off of e-bay, a few years ago, cheap- a friend recommended the seller. I was skeptical about its efficacy, so I used it on my watch first. Good Golly Miss Molly, the crap that came off that thing. If it was just making noise, it wouldn''t have dislodged so much crud.
Whever my friends come over, I make them put their jewelry in my ultrasonic. I cannot believe how dirty most people allow their jewelry to become!
AAAAANNNNDDD...I can''t believe how many people look at their sparkly, freshly ultrasonic-ed jewelry, admire, & then PUT THEIR FINGERS ALL OVER THE STONES. Good god, were you people dropped on your heads as children?!?! Never touch the stones! Jeesh.