Jewels
From Zelda Wiki.org
These four Jewels are key items in The Legend of Zelda: Oracle of Seasons. They are hidden around Holodrum. They must be used to enter Tarm Ruins. The four Jewels are the Pyramid Jewel, the X-Shaped Jewel, the Round Jewel, and the Square Jewel.
Interestingly enough, the four jewels correspond to the face buttons on the Playstation controllers.
