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Gary, you can use a cotigura (coticule slurry stone) on a belgium blue to raise a slurry. It's OK to go from finer to coarser. Or you can get a blue slurry stone and those will work fine especially...

You can actually see the garnets if you hold the stone at the right angle in good light. They look like tiny polka dots. The blues cut quickly and I always use them with a slurry. After it looks like...