SB 10.56.11
dine dine svarna-bharan
astau sa srjati prabho
durbhiksa-mary-aristani
sarpadhi-vyadhayo ’subhah
na santi mayinas tatra
yatraste ’bhyarcito manih
Translation:
Each day the gem would produce eight bharas of gold, my dear Prabhu, and the place in which it was kept and properly worshiped would be free of calamities such as famine or untimely death, and also of evils like snake bites, mental and physical disorders and the presence of deceitful persons.
Purport:
Srila Sridhara Svami gives the following sastric reference concerning the bhara:
caturbhir vrihibhir guñjam
guñjah pañca panam panan
astau dharanam astau ca
karsam tams caturah palam
tulam pala-satam prahur
bharah syad vimsatis tulah
“Four rice grains are called one guñja; five guñjas, one pana; eight panas, one karsa; four karsas, one pala; and one hundred palas, one tula. Twenty tulas make up one bhara.” Since there are about 3,700 grains of rice in an ounce, the Syamantaka jewel was producing approximately 170 pounds of gold every day.