None whatsoever. There's nary a scratch despite wearing all 3 bracelets for several months now (I sleep and shower in them too) and they tend to slide and shift positions along my wrist. Carnelian is pretty resilient. But I gotta wipe it every now and then because my body creams and soap would smear or stick onto its surface sometimes.
Here's a pic for reference:
View attachment 5631724
Hm I think mop can definitely become dull over time and if not cared for properly. It's not advisable to have any contact with water, lotions, perfumes, makeup or any other household chemicals or solutions. But I don't have any VCA mop pieces to be honest so I can't provide proper input.