Is it solid Palladium, or plated? Certain metals are Rhodium plated, but it can and will wear off, showing the original metal underneath.
I’ll ask my mate later tonight when we go for beers, he’s a goldsmith of nearly forty years experience, so he ought to have a clue.
TBH, why bother. I’ve got a gold wedding ring that was my great-granddad’s, it’s dated 1916 inside, and it’s a lovely rose gold, and I’ve got a titanium ring and three silver rings, all are bashed around, but that’s what happens when you wear rings and never take them off. It’s patina, it’s part of their life and charm and character, polishing will only delay the inevitable, which is more dings and scratches, so what’s the point?