Hello everyone - I have never owned an ultrasonic cleaner, but I am considering a purchase of one. I know not to use this type of cleaner on pave diamond work, heavily included diamonds, and many semi-precious stones. Thus, my question is whether the ultrasonic cleaner is completely safe for 14K and 18K gold jewelry without any gemstones? I have several hollow gold bracelets and gold neckchains, and I just want to be completely sure that the rapid vibration of the ultrasonic will not cause unnecessary friction and weaken links or clasps. Thank you.