Board Thread:General Discussion/@comment-25539649-20150620190612/@comment-25849088-20150630024410

Lemme start of with this. Remember in sword to the sword how the Diamond has Blue, Pink, Yellow, and White? In the episode where they find the maze and the mural and stuff, there were only 3 diamonds in the emblem on the floor, same as on Peridot's ship. The arena was most likely built before Rose stopped the corruption on Earth, which is why the pink diamond is included in the emblem. Back to the mural, there is seen to be a white gem with spiky hair and a diamond symbol on her chest. Her hair actually almost resembles common clear  quartz... and Rose is speculated to be the Pink diamond, but then cut out in the beginning of the war. Rose is also confirmed quartz. If White diamond is quartz, couldn't Blue diamond and Yellow diamond be quartz too? This brings me to the line where Jasper talks about Yellow diamond. Yellow diamond ranks above Jasper, so it would make sense that she would come and check up on Jasper and Peridot. The stevenbomb preview says "Sardonyx is coming", reinforcing the fact that she is a powerful and imposing gem, most likely Yellow diamond, which is who Jasper most likely last talked to. (And their ships would probably indicate if they went missing or if they crashed.) Also, Sardonyx is yellow, and quartz gems tend to be large. (I know that Amethyst is small, but Jasper calls her an "undercooked runt". Maybe she was growing too long so she formed stunted? Also, forming with Garnet made her absolutely gargantuan.) If Rose was such a powerful gem, it would make sense that the "Diamond Authority" would come after her if she was a part of it, which could explain why a large possibly quartz possibly diamond gem was attacking the big boss, Rose, in sworn to the sword. Anyway, my theory is that Sardonyx is a large, yellow quartz gem, taking her place as Yellow Diamond in the diamond authority.

Theory Two: Sardonyx is a gem that was lost long before the world by going onto a warp pad that was busted after she reached the other end. She then makes her way to Earth (or to homeworld, and showing what it looks like  and how different it is) by means of travel similar to Lapis' way.

Theory Three: Life of a gem on homeworld.

threeory foure= OMgz GrnET @ND PERle!!1!11!11!!!one1!!!!1!!11