Platinum. I'm good at getting them clean enough, but getting the stones cleaned and metal polished up would be good after a decade.

When I think of "quiet" I think of the absence of noise, whereas "peace" is more a sense of physical/emotional wellbeing. Not all noise is innately harmful, and making the complete absence of noise the goal can limit the work to punitive enforcement vs. understanding how noise affects individuals and communities, and how it can be measured/mitigated/reduced in thoughtful, constructive ways.