US and stones

[stci]

What type of stones don't support ultrasonic cleaning?

 

[bunnycat]

Pearls, emeralds, opal and amber come to mind off the bat.

 

[stci]

Amethyst ?

 

[diamondringlover]

I remember there was a thread somewhere on pricescope discussing this but I cant for the life of me find it...anyway I did find this on the internet...so it looks like amethyst can be put in a ultrasonic

http://education.jewelry-discount-house.com/Jewelry-Care-Cleaning.html