Gray Diamond

Gray Diamond, previously known as White Diamond, is one of the four members of the Great Diamond Authority that rule the Kristalli Imperium. Gray Diamond is the only single-Gem Diamond, and is also the only Diamond that is still alive. Gray Diamond killed Blue Diamond and engaged in wars with Green Diamond until they were the only Diamond left. Gray Diamond appears to have knowledge of the players of Abyssal Oddity, a trait shared by Malpeiyc.

It is heavily implied that there is a connection between Gray Diamond and the Scorched Sentinel.