My project is to renovate the bathroom. For the vanity top I intend
to use polished white marble 12 x 12 tiles, the proposed countertop
being 24 in x 6 ft. There will be an undercounter ceramic sink.
This is like the set up found in hotels and restaurants where the
countertop has a cutout for the sink and there is a slight overhang.
I like the idea of just wiping stuff into the sink without having to
run the rag over a raised lip as would be the case of a surface mount
sink.

I shouldn't have too much trouble making the cutout for the sink. The
question is what do I have to do to polish the cut so that it matches
the glass smooth finish of the marble tile? I suppose I will have to
use whetstone to polish it to glass smoth. Is there a clear wax
varnish I have to apply after that?