You can spend hours looking for emerald and diamond rings links without getting anywhere.

You can spend hours looking for emerald and diamond rings links without getting anywhere.

Sometimes known as adamant, it is the hardest known naturally occurring material, scoring 10 on the old Mohs scale of mineral hardness. Now if the link above did not give you exactly what you were looking for then look at the emerald and diamond rings links on this page.
The material boron nitride, when in