I'm using a diamond blade to cut bluestone for a patio. The blade was fairly new when I started. I've cut through about 30' of 1.5 to 2" stone and it went pretty easy but now it is taking a lot more time and effort to cut through. The blade and saw starts to bog down and the blade gets very hot. There is still plenty of blade left (cutting mason brick I've taken a 7 1/4" blade down to a nub before I had to replace it) and you can see and feel diamond bits in the blade still. I remember hearing about (I believe it was a This Old House segment) a stone company that was making soapstone sinks and counters and they used a granite table top on their cutting machines because it kept the blades sharp on account that the soapstone was a soft material. Would bluestone fall into this situation as well and what exactly is it that "dulls" the blade and how to I sharpen it? Can I run it through a granite boulder?