Gold and gold receivables held by euro zone central banks rose by 21 million euros to 367.432 billion euros in the week ending Jan. 7, the European Central Bank said on Tuesday.

Net foreign exchange reserves in the Eurosystem of central banks rose by 0.2 billion euros to 180.3 billion euros, the ECB said in its regular weekly consolidated financial statement.

Gold holdings rose because of purchase by the central bank of Estonia to cover its contribution to the ECB's foreign reserve assets, the ECB said.

The size of the Eurosystem of central banks' balance sheet amounted to 1.966 trillion euros, the first time the weekly statement included Estonia's central bank. Estonia joined the euro zone at the beginning of the year.

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