Now corundum is a fairly common mineral.
Are rubies rare.
In nature diamonds are rare but not so in the gem world.
They are also exceptionally scarce.
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.
All rubies are rare but those from myanmar formerly burma set the standard for quality and color.
The emery on your emery boards and sand paper may contain.
While rubies from thailand contain relatively high iron content which can result in overly dark reds with brownish or purplish overtones the geological conditions in myanmar generally produce rubies with very little trace iron.
Rubies and sapphires are different colored varieties of the mineral corundum.