The Hardest Naturally Occurring Substance on Earth


Yep - You all know from grammar school that is the diamond, which incidentally is what is used to make the stylus of our turntable cartridges.  If it is so hard, and it is going up against some fairly soft vinyl, why do we worry about poor quality LPs damaging the cartridge or stylus?  Sure, I understand the cantilever, but the actual Stylus?  The old phrase for me is "Does Not Compute".   What are your thoughts and insights?
pgaulke60
Rodman“Counting them is difficult though, with all those pesky echos.“

>>>>>I’m not 100% but you can’t have echos in a sphere. But you can have echos in a block.
Sphere?    Block?     Never been that normal.      Perhaps: a rhombohedral ellipsoid!
There are some folks on here who polish their diamond upon hearing the difference. Diamond-Brite---on a website near you. 
dill:

Concave or convex? Worn out ? Moves from left to right, but stays on the bottom?

Please say more...