If it's glazed, there's a limit on how much you can put a bevel or round over on the edge. Then, it depends on if it is polished or not, as a polished tile will need working up to a finer grit.
On something less than porcelain, a rubbing block can be used that is usually carbide rather than diamonds.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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