Part 4 made once again by the lovely KJD/Artifiziell! Song from the SU OST. Her description explains a bit of the comic, so I'll put it here:
This part is a flashback - Next part of the Moonstone origin comic I’ve been doing, and a new gem as well, Andesine~ Still deciding whether to partially animate or fully animate the next part though.
This part helps explain a little more about Orthoclase and Albite and the roles they play in the Diamond-led gem society.
-KJD's description on Tumblr