Lignum nephriticum cup crafted from narra wood (the namesake with the province) produced opalescent hues when h2o is poured into it. These wood cups have been A serious pre-colonial and colonial business of Naga. Naga may be the native pre-colonial title of town. It's named after the narra tree https://josuezoalx.thezenweb.com/the-smart-trick-of-23naga-that-nobody-is-discussing-66008498