Aries

The first sign of the zodiac.  Those born between March 21st and April 20th have Aries as their Sun sign.  Also called the ram, Aries is a yang, or masculine, cardinal fire sign.  

The ruling planet of Aries is Mars, named for the Roman god of war.  Mars is all about force and energy; both of which Aries have in spades.  As a fire sign, Aries has a hot temper.

Aries is associated with the color red: fire engine red! And amongst other gems, the diamond, which is beautiful, valuable, and nearly indestructible as the hardest known natural material on Earth.