Lignum nephriticum cup crafted from narra wood (the namesake with the province) developed opalescent hues when drinking water is poured into it. These picket cups were a major pre-colonial and colonial market of Naga. Naga is definitely the native pre-colonial title of town. It's named following the narra tree https://donovanftgrc.ampblogs.com/23naga-can-be-fun-for-anyone-64812514