"When all three stones are placed in the alter within the temple of time, and the ancient melody is played on the sacred Ocarina, the door of time opens, allowing entry into the sacred realm where the Triforce rests."
The Spiritual Stone of the Forest (The Kokiri's Emerald)
The Spiritual Stone of Fire (The Goron's Ruby)
The Spiritual stone of Water (The Zora's Sapphire)