Guard well your spare moments. They are like uncut diamonds. Discard them and their value will never be known. Improve them and they will become the brightest gems in a useful life. ~ Ralph Waldo Emerson
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So in Three Gems and a Baby, thre´s a moment when Steven´s gem brightens for the fisrt time
and it just hit me that it could as well be Crewniverse´s nod all the way back too episode 1 named Gem Glow (Coincindence? I think not!) where, as we all know, Steven´s Gem glows as well but this time its the first time he summons his shield.
Steven Universe, Episode 1:
A boy discovers his powers are activated by eating icecream.
Steven Universe, Episode 71:
A boy discovers that a mass of dead alien corpses the size of New England is incubating in the earth's core and when it hatches it will completely obliterate the entire planet leaving no survivors.