What good is a jewel that ain't still precious?

from Frank Ocean – Pyramids Lyrics on Rap Genius

Meaning

A diamond’s value derives from the fact that diamonds are “precious”, they are rare, beautiful, have special properties, etc.

When the Cleopatra of this song ceases to be “precious” figuratively, by betraying her mate, she loses all her special value to him (and perhaps in general)

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