DIAMONDS are the toughest gem in the world, and can be found in 6 of the 7 continents across the world (sorry Antartica). Many times referred to as the "King of Gems", diamonds symbolize light as when its colorless facets catch the sun, they display the entire color spectrum. Diamonds have also been know as a strong symbol of invincibility in the wearer.
ONYX is one of the most anciently used stones with admirers from even the earliest human civilizations. The stone was historically used as amulets to either be worn or embedded in weaponry or armor to increase the strength and protection of warriors in battle.
RUBIES are a precious gemstone, and are symbolic of vitality, prosperity, and courage.