Mogok Ruby
This ruby is from Mogok, a famous mining area in the country of Myanmar.
Chromium
The chromium in crystal makes it red and sometimes causes a glow.
Marble Clue
This ruby is embedded in white calcite. It is a hint that the ruby was created in marble.
Ruby is famous for the beauty of its red color. Red represents strong emotions like love and anger. The most famous rubies are found in marble, a metamorphic rock. These have rich red color and usually glow a bright red under sunlight. The glow makes the red color even stronger. Darker rubies are found in igneous rock. 
Colors
Very bright red to a slightly purplish red make rubies really stand out.
History

Warriors

of Burma

Rubies from Burma have been around since 600 AD. Early Burmese warriors carried rubies to make them invincible in battle. They actually put the rubies under their skin. Ouch!
Famous Ruby
These real ruby slippers were made to celebrate the 50th anniversary of the movie The Wizard of Oz.
Courtesy Harry Winston
what's in a name?
(noun) The name ruby comes from the Latin word ruber, which means “red.”

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