Article 82
Member States may provide that, in respect of the supply of goods and services, the taxable amount is to include the value of exempt investment gold within the meaning of Article 346, which has been provided by the customer to be used as basis for working and which as a result, loses its VAT exempt investment gold status when such goods and services are supplied. The value to be used is the open market value of the investment gold at the time that those goods and services are supplied.