They are also exceptionally scarce.
Are rubies rare.
Ranking a 9 on the mohs scale of hardness diamond is a 10 corundum has been mined extensively for abrasives.
Today s discerning collectors are looking for jewelry that emphasizes rare striking and sometimes almost impossible to find stones.
Forget diamonds emeralds and rubies.
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.
In nature diamonds are rare but not so in the gem world.
All rubies are rare but those from myanmar formerly burma set the standard for quality and color.
Now corundum is a fairly common mineral.