Lignum nephriticum cup made of narra wood (the namesake with the province) created opalescent colors when drinking water is poured into it. These wood cups were A significant pre-colonial and colonial marketplace of Naga. Naga will be the indigenous pre-colonial title of town. It's named following the narra tree https://casper7744333.p2blogs.com/27664188/how-23naga-can-save-you-time-stress-and-money