પહણીઆ (રૂપીઆ) ના પારેખ પથ્થર.

pahaṇīā (rūpīā) nā pārēkha paththara.

Literally: The assayer of rupees is a stone.
What it means: True worth or authenticity can only be determined by a reliable, objective test.

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.