The government has increased the tariff value of gold to 521 dollar per 10 grams, making import of gold in any form costlier. According to an official release however, the tariff value for silver has been lowered to 920 dollar per kg.The base price on which the customs duty is determined to prevent under invoicing and released every fortnight for gold stood at 516 dollar per 10 grams and for silver at 930 dollar a kg.