Filigree is a sophisticated jewelry-making technique dating back more than 5,000 years. Known as Ngan Yad Lai in Thai, the complicated technique to make a finished piece requires as many as 35 delicate and meticulous steps. The art was on the verge of fading away when, 50 years ago, it was reinvigorated by Chinese migrants in the Ban Kad area of Chiang Mai province who taught this ancient jewelry-making technique to the Upanan family.