Pendant of Virtue

The Pendants of Virtue appear in A Link to the Past and are required in order to retrieve the Master Sword. Link must travel to three dungeons and collect each one before going to the Lost Woods to find the Master Sword. An ancient Hylian verse on the pedestal of the Master Sword about the pendants reads:

"The Hero's triumph on Cataclysm's Eve Wins three symbols of virtue. The Master Sword he will then retrieve, Keeping the Knights' line true."

The Pendant of Courage

 * Location: The Eastern Palace
 * Guardian: Armos Knights

The Pendant of Wisdom

 * Location: The Desert Palace
 * Guardian: Lanmolas

The Pendant of Power

 * Location: The Tower of Hera
 * Guardian: Moldorm

Theories of the Origin of the Pendants

 * While it is not certain, it is possible there could be some connection between the Pendants of Virtue and the Spiritual Stones of The Legend of Zelda: Ocarina of Time, seeing as both sets are needed for Link to gain the Master Sword. It is possible the Pendants could also be the actual remains of the Spiritual Stones given their common colors.
 * Another possibility could be that the Spiritual Stones were magically altered to become the Pendants of Virtue in one timeline and the Goddess Pearls in the other. The way how in each game (ALttP, OoT, and TWW) the player must go through three separate quests to obtain three related objects with some connection to the Master Sword seems to present the possibility that all three sets of objects could quite possibly be one and the same.