HONG KONG, Jan. 31, 2012 /PRNewswire-Asia/ -- JewelleryNetAsia( http://www.jewellerynetasia.com ) announced today the launch of a downloadable digital Jewellery Exhibition Calendar( http://www.jewellerynetasia.com/en/IndustryNews/4598/JewelleryNetAsia_la... ) for jewellery events staged in 2012.