تحفة النظار في غرايب الامصار وعجايب الاسفار 13.98.4

13.98.4

Their custom is that any ruby stone whose price reaches a hundred fanam — with a after the f and the n — belongs to the sultan, who pays its price and takes it, while whatever is below that value belongs to its owners. A hundred fanam are equivalent to six gold dinars.