Tariff values for imported edible oils, precious metals and areca nuts are fixed under customs valuation rules. Fixation of tariff values is made for specified imported goods, including edible oils and related products, brass scrap, gold, silver and areca nuts, under section 14(2) of the Customs Act, 1962. The notification prescribes tariff values in US dollars for each covered item, including separate treatment for gold and silver in specified forms, and states that several values remain unchanged. It also provides that conversion of tariff value uses the exchange rate notified under the Customs Act, with the relevant date being the date of presentation of the bill of entry.