બાપેલું વેગણ લીલું થાય નહીં.

bāpēluṁ vēgaṇa līluṁ thāya nahīṁ.

Literally: A boiled eggplant cannot become green again.
What it means: Once a person's reputation or a situation is completely ruined, it can never be restored to its original state.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.