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 major pre-colonial and colonial business of Naga. Naga could be the indigenous pre-colonial name of the town. It's named following the narra https://top1topi88agenslotjudionl45544.blogminds.com/the-smart-trick-of-23naga-that-nobody-is-discussing-25942965