As you can see in the first panel, Ruby's old form and Sapphire's old form are shown.
As you can see in the second panel. There are two thee rubies with the one we know jumping in the middle(gem is on left hand.) This was taken from the promo of the next Stevenbomb.

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Steven Universe Theories (Continued)
RandomThis goes along with my previous theories! I hit the limit on the other book.