Royal Copenhagen porcelain flagship store
https://www.royalcopenhagen.com/home is situated just beside Georg Jensen (If I remember correctly there is just a Disney shop between them, and this you can safely skip!) The store showcases their lovely porcelain, some of their lines date back to the 1770s. Last time I brought back the alphabet mug and plate as a nice memento.
Ole Lynggaard Flagship store
https://www.olelynggaard.com/en/find-store/copenhagen-city.htm in Ny Østergade 4, the first side street to Strøget. A beautiful flagship store, with amazing, spectacular and very expensive jewellery is also worth a visit. And if you do no enter you should at least gaze at their spectacular window displays.