Yellow Diamond

"Yellow Diamond" was first mentioned, by Jasper, in "The Return".

Jasper & Peridot
They hold some sort of authority over them, as they needed to report to her. As if she is their leader/ruler.

Gemology
Learn about the diamond gemstone here. To learn about the metaphysical properties of yellow diamond, click here.

Trivia

 * They are an authoritative figure to some Homeworld Gems, such as Jasper and Peridot.
 * Both Peridot and Jasper have a yellow diamond on their chests and other parts of their uniform. Which may mean they follow her orders. Jasper might be a soldier and Peridot a technichan as in an army.
 * In "Jail Break" there is a yellow diamond symbol on the floor along with both a white and blue diamond symbol where Garnet and Jasper fight.