EASY! Where to Find Noctilucous Jade in Genshin Impact, Location! (Big Business Quest Guide)
Go south east of Sal Terrae to find the noctilucous jade location to complete the big business quest. Need to trade in 3 of these jades for the notices.
You can also go to mingyun village or Liyue Harbor which is home to a merchant named Shitou, who is able to sell you Noctilucous Jade for 1000 moras each.