Zutara - Proposal

While visiting the Water Tribe, Zuko asks Kanna about the necklace Katara wore. After getting a long lesson in betrothal necklaces, Zuko wanted to make one for Katara. Asking for advice and tips from her grandmother, Zuko went to work in secret.

Once he was finished, he showed it Sokka (who obviously joked about the quality and worksmanship) then to Hakoda to ask for his daughter's hand in marriage.