Garnet's Realm is a location that first appeared in Steven Universe: The Movie. This is the realm where Ruby and Sapphire (after being reset) went to when they accidentally fused again. Within this realm they were able to form Garnet once again.
The background is a pink to blue gradient which represents Ruby and Sapphire respectively. The floor is blue. The color scheme and atmosphere as a whole is very calm and serene.
This is where both Ruby and Sapphire reside when fused as Garnet. It is unknown if this is a place that actually exists, or simply a visual used in the song it appeared in.
- The validity of the realm is overall unknown, as it is unknown to be a real place or a simple imagination.