So um Greg is brown diamond, Im sorry but Ive figured it out, and before anyone else.
Heres proof:
Grege uh- Brown diamond gets scared whenever gem stuff happens and tries to leave or gets embarrased.
Brown diamond Is unable to fuse because hes In his human form
Brown diamonds gem is located on the back of his head covered by his hair,
Brown diamond is loved by all the humans because he is not one.
Brown diamond is scared of the Diamonds
Now heres why hes a human now:
So I think Its a bit like pink diamond, He hated Yellow and Blue and so he ran, After his dissapearance the diamonds got upset and dissapointed, they started treating Rose like their child refusing to give her a colony, Greg Transforms into his human form with his long hair to cover his gem, Later he meets rose quartz, and they fall inlove, fusing to make steven.
The end
Any questions will be answered
