I personally do not like scratches so I would never stack the ecrou with a five motif. Also the beauty of the nuts on the ecrou relies on them staying shiny which means UNSCRATCHED. So I won’t be stacking any five motifs with the Ecrou. I posted the pics for people that don’t worry about scratching. And yes, I think the chalcedony would get scratched by the Ecrou. Not obvious but hairline scratches that would be visible upon closer Inspection.love your stack! i also have the chalcedony 5, and want to stack it with the ecrou, but i’m worried the ecrou will scratch the chalcedony. have you noticed any problems with that?