The Gemini Coin is a coin that is a part of the Voice of the Night Sky quest and is needed to complete the Signs of the Zodiac subquest. You can find this coin in the zoom-mode spot located in Silent Cavern, which requires a dolphin partner to unlock. Along with the coin are some some Starck's Demoiselles.
This coin is engraved with the constellation Gemini, one of the twelve signs of the zodiac, represented by twins.
- The name of the Gemini constellation translates to "twins" in Latin, predictably enough.
- The Gemini constellation, in the night sky, is bordered by Taurus to the west and Cancer to the east, with the Auriga and Lynx constellations to the north and the Monoceros constellation to the south.
- In Greek mythology, the twins depicted in this constellation are two half-brothers named Castor and Pollux, both sons of Leda, the queen of Sparta. Pollux was the son of Zeus and Leda, whereas Castor was the son of Leda and Tyndareus. Tyndareus was the King of Sparta, and Leda's husband.