A visitor tries a piece of jewellery at the 11th International Jewellery Art Fair in Amsterdam on Nov. 4, 2012. The four-day exhibition closed on Sunday attracted more than 150 jewellery designers from all over the world. (Xinhua/Sylvia Lederer)

A visitor tries a piece of jewellery at the 11th International Jewellery Art Fair in Amsterdam on Nov. 4, 2012. The four-day exhibition closed on Sunday attracted more than 150 jewellery designers from all over the world. (Xinhua/Sylvia Lederer)

A visitor tries a piece of jewellery at the 11th International Jewellery Art Fair in Amsterdam on Nov. 4, 2012. The four-day exhibition closed on Sunday attracted more than 150 jewellery designers from all over the world. (Xinhua/Sylvia Lederer)