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Houseki no Kuni

No.174971506 ViewReplyOriginalReport
I understand now, it's imprinting.
All the gems are born and given eyes by Sensei, so the first thing they see is Sensei, that's why they love Sensei so much.
Craigslist have been seeing the world through Ghost's eyes, so when Aechmea gave him new eyes, imprinting towards Aechmea happens.
Phos doesn't love Sensei so much now because Phos is using Lapis's eyes and one of the eyes is pearl.