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The garnets are not the same size in both stones, the garnets in the blue are larger than those in the yellow. Howard told me that the difference in size (and thus grit) have to do with the...

It is my understanding that this is true on average. Most y/g stones should be softer than b/g; however, since these are natural stones there is variation. Some b/g stones will be as soft or softer...

The belgian blue is not rated lower than the coticule because of the lower garnet content. It is rated as a courser stone because the garnet particles in the blue are significantly larger than those...