I have pewter buckle and Cantle and they wear fine.. no problem with scratches .

Modern pewter is a different alloy than the old high lead alloy of historical pewter, so stands up to wear far better. A far more subtle metal than chrome.

I like pewter, not being able to afford silver, as it is more natural and of a good colour rather than a chrome plated cantle which for me tends to look cheap. Metals can vary a lot in colour... try putting silver next to other white metals.