I used to work a lot with this type of stone in South Florida. The biggest
problem you are going to run into is that it will tear your diamonds up real
quick. I have found you need to use metal bond diamonds all the way to 400 or
800 and than polish with standard polishing powders. Also make sure they
are in fact coral..South Florida has a lot of Cuban tile which can look the
same. Pics would help. If you need to send them to my email at
fhueston@aol.com and let me take a look