A Few Little Known Facts About Ruby

July is ruby month, so that makes a blog entry about ruby apropos. But what can I write about ruby that hasn't already been said elsewhere? 

Not much, but let me try. Here are some of the lesser known facts about this pretty gem. 

As you surely know, ruby is the pinkish red version of the mineral "corundum". But how pinkish red does corundum have to be to be ruby, and not pink sapphire? The answer...
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