The emery on your emery boards and sand paper may contain.
Are rubies rare.
Today s discerning collectors are looking for jewelry that emphasizes rare striking and sometimes almost impossible to find stones.
They are also exceptionally scarce.
Forget diamonds emeralds and rubies.
Large gem quality rubies can be more valuable than comparably sized diamonds and are certainly rarer in fact smaller blue sapphires 1 3 cts are relatively abundant compared to small gem quality rubies.
Now corundum is a fairly common mineral.
Ranking a 9 on the mohs scale of hardness diamond is a 10 corundum has been mined extensively for abrasives.
In nature diamonds are rare but not so in the gem world.