For grinding or cutting wheels, there is a spec printed on each disc that will give info on what makes up the disc, and where its strengths may lie (ie large agressive grit, and bond strength holding it all together)
For vitrified mounted points like you've pictured, there is a standard, but for the sort of stones you get with a dremel or other tool, it's probably pot luck.
Color may signify various grits for some manufacturers, but your mileage may vary. Is there any spec written on it? To be blunt, if it was for a job that mattered,you wouldn't be using the cheap ones that came in the box in any case.
If you were to buy some of those 'vitrified mounted points', there are a few options available from St Gobain (Flexovit), and they have a classification system to make a bit more sense of it all.
Using the convention in the top pic, their spec shows AlOx grit, various grits (36, 46, 60) and PV signifying Pointed vitrified.
If you have the money and the inclination, get some carbide bits and watch the metal chips fly.
-Mitch
'El Burro' 2012 Defender 90.
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