Spiritual Stone of Water

The, also known as the Zora's Engagement Ring, and the Zora's Sapphire, is an OoT3D: in.

Location and Uses
The Spiritual Stone of Water was given to Princess Ruto by her mother, who told her to entrust it to the man who will become her husband. After Link saves Ruto from Inside Jabu-Jabu's Belly, the princess falls in love with the hero and gives him the Zora's Sapphire as a symbol of their "engagement."