Kasauti is a small stone which is used by goldsmiths to test the purity of gold. They rub the gold on this stone and based on its impression, they arrive at a decision regarding the purity of gold.

Kasauti is frequently used in figurating sense as well. For example:

Veh kasauti par kharA nahee(N) utrA.

Here is implies he just failed in the test. His performance was not upto the mark. He failed to accompalish the assigned task satisfactorily.

Another usage:

Veh kasauti par kasA gayA.

He was tested on a touchstone.

Kasauti is also known as "a touchstone, test"

'Kasauti par kasna' may be translated as 'to put a person through his facings'