Steven Universe - Diamond mural

I think not: the gem would be bigger than her own waist.
However, I do think that there is some symbolic to be read with the orbs on each picture. Maybe WD is shown as the representative of the Homeworld planet. As for the other two, it is more complex, but at least one of the two (my bet is on YD) should be in charge of the colonies.

D-does white diamond have two gems???