Okay this was something I thought of while reading some My Hero Academia fanfics so yeah.
Garnet
•Sweet Child
•Second most loveable human(First is Steven)
Amethyst
•Babe
•Cutie
Pearl
•My love
•Mine!
Lapis
•Cuddle Muffin
•Smoochies (I'm half sure I spelled that correctly)
Peridot
•Dork
•Boo
Steven
•Lovely
•Darling
Edit+Bonus!
Bismuth
•The most beautiful person in the world.
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That's all the Gems I thought of on the top of my head. Lol
If you have a suggestion for a quick thing like this let me know I would like to hear them. 🙂