Rubies and sapphires are different colored varieties of the mineral corundum.
Are rubies rare.
Today s discerning collectors are looking for jewelry that emphasizes rare striking and sometimes almost impossible to find stones.
Ranking a 9 on the mohs scale of hardness diamond is a 10 corundum has been mined extensively for abrasives.
All rubies are rare but those from myanmar formerly burma set the standard for quality and color.
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.
Forget diamonds emeralds and rubies.
The emery on your emery boards and sand paper may contain.
Now corundum is a fairly common mineral.