I searched a bit on this site, and found some really helpful threads. This one is mostly about taking care of the silver, but the first post in particular is helpful. Cleaning Turquoise and silver jewlery
I believe water alone will not hurt turquoise, but any that gets under the stone and into the setting (in Native made jewelry) is what causes the problem.
I understand now why you don’t want further color change in your stones, makes sense. I still like that “greasy green” color, but have never had all the stones change to that. The older pieces I bought have done all their color change apparently, because the stones don’t look any different after years of me wearing them.
If that makes you weird, you fit right in here 