જો ગધેડે મુલક લેવાય, તો ઘોડાના ભાવ કાઈ પૂછત નહીં.

jō gadhēḍē mulaka lēvāya, tō ghōḍānā bhāva kāī pūchata nahīṁ.

Literally: If a country could be conquered by donkeys, then no one would ask the price of horses.
What it means: Said when someone expects cheap, inferior, or incompetent means to achieve results that require high skill and quality.

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.