I bought a jewelry cleaner at an auction a couple months ago. It had a blue solution with it for jewelry. I did run it with a case cleaning solution and a 150 38 Sp cases and it did a good job. Wife asked me a couple days ago if she should clean some rings and a couple necklaces that have never been cleaned. The woman likes gold and diamonds and emeralds. I cleaned an old mine cut emerald ring with my Hornady sonic cleaner a year or so ago. It worked just fine and I was amazed how it looked after coming out..of course it had a 100 yrs of dirt on it. I got the darn thing at an auction and I was a bit afraid it would hurt the stone. Even with a 10x loupe it looks unchanged other than clean. The Hornady cleaner does a good job on brass. Got to figure out a homemade cleaning solution for it though. That boughten stuff is spensive
Edited to ad..if you get a sonic cleaner get one that heats up. Seems to work better