Marble and quartz was just lovely to cut, smooth and easy. This is a piece of 10mm Rosa Aurora (AKA Estremoz) from Portugal.
This was dry and slowish, around 3000rpm, but you just didn't need to be any faster. It cut quick enough and was quite controlable.
However, this was a smaller washer that simply wouldn't work on Porcelain, so the next size up cuts slightly shorter than this by 0.5mm. Not a great deal - but it meant it worked on stone and Porcelain. As what we're looking for here is a one size fits all solution we have to go with the Porcelain Specification.
It will still work beautifully on all stone though.