Prong Set Eternity Band Question

[brellymom]

There have been some posts about prong set eternity bands - how the girdles can scratch the ering if worn without a spacer. Is this true for all eternity bands - no matter the shape? I have an eternity band with RBs where I can defintely see how this could happen - it''s like a little saw! Would it be the same for a square cut stone - eg asscher or emerald cut eternity band? Would a prong setting for those stones create the same risk? Thanks much!