Diamantes means "diamonds." While it might seem like a common word, its use in this song is particularly interesting and metaphorical.
Justin Quiles sings, "Pero es que así es que se forman los diamantes" (But that's how diamonds are formed). He uses the creation of diamonds under immense pressure as a metaphor for the struggles and difficulties in a relationship. It suggests that tough times are necessary to forge something strong and valuable, just like diamonds are formed from carbon under extreme conditions. This makes the word memorable and gives it a deeper meaning within the song's context.
Justin Quiles brings us a super romantic track with "DIAMANTE"! It's all about a guy who's messed up in a relationship and is now desperate to win his ex back. He's looking back, wishing he could turn back time to fix his mistakes, singing, "Si yo pudiera darle al tiempo pa' atrás / Borraría to' lo que hice mal" [If I could turn back time / I'd erase everything I did wrong].
He knows he made some errors, maybe even caused some drama, but he truly believes their love is worth fighting for. He compares their struggles and the pressure they faced to how diamonds are formed, saying, "Mala mía por la presión / Pero es que así es que se forman los diamantes" [My bad for the pressure / But that's how diamonds are formed]. He's basically saying that all the tough times have made their connection stronger, like a diamond, and he's ready to steal a kiss and get back to how things used to be!