In the dwarven halls there are a few pairs of small teleporter pads/stones that can teleport you back and forth across the river at various places. South and I think west of the main teleporter pad is one that will get you over to the jeweler.
For the dwarven teleporter scroll, you can get one in the Blue Boar inn (in the room with the dwarf), in the dwarven village, or from the dwarven king after you do the stone axe quest.