Diamond Authority

The Great Diamond Authority was the matriarchal body of Gem leaders.

Its membership consisted of White Diamond, Yellow Diamond, Blue Diamond and formerly Pink Diamond.

They were once the absolute ruling power over the Gems and its remaining active colonies until the beginning of Era 3 and their replacement through democratic elections.

Despite this, the Diamonds still seem to retain their status as leaders on Homeworld, even if to a lesser extent.

Even still retaining some influence over Homeworld, the Diamonds have begun dedicating themselves to helping Gems through their new specialties.

Display of Loyality
Most Gems were very loyal and legitimately believed the Diamonds were the most elite beings to ever exist.

Some were passionate and enthusiastic about working for any Diamond.

The loyalty Gems had for their Diamonds was such that some would do anything to avenge them.

In addition to being widely regarded as a tragedy, Pink Diamond's "death" incited more than a few Gems to go so far as to seek vengeance on her behalf.

Symbols
The symbol of the Great Diamond Authority appears on many Gem structures and has changed over time.

On the structures mostly built as early as around 6,000 years ago, the logo consisted of four connecting diamond shapes: white (top), yellow (left), blue (right) and pink (bottom).

On modern structures and drawings the Pink Diamond symbol was removed leaving only the white, yellow and blue symbol shapes (now in the form of overlapping triangles with a small dark triangle in the middle).

In addition to appearing on structures, the redesigned symbol appeared on the interiors of all modern Gem ships.

Base of Operations

 * Gem Homeworld
 * Earth (Pink Diamond)

Members

 * White Diamond (Leader)
 * Yellow Diamond
 * Blue Diamond
 * Pink Diamon (Formerly)
 * Steven Universe (Temporarily)