The three stems are turned to the same profile deliberately, which is harder than it sounds. Each wood cuts differently, so the maker adjusts tool angle and speed for every one while trying to land on an identical shape, and the set is only kept together if all three read the same in silhouette.
The pale and honey stems are finished with oil alone. The dark one is blackened after turning, then oiled the same way, so all three take light at the same level and nothing in the set looks glossier than the rest.
Sets are grouped at the end rather than made to order. Pieces are laid out together and matched by tone and by how the turning fell, and any stem that does not sit right beside the other two goes back into single stock. It is the easiest piece for a shop to display, because the set does the work.