1) Mark Lash (for pre-made only. I tried the custom route with them and it was a disaster but thier pre-made jewellery is stunning and unique)
2) Birks. It''s the Canadian version of Tiffany''s (so it''s pricey) but the product is stunning and the service is truly out of this world. The Bloor Street store is the best. The service is worth every penny of mark-up.
3) Fraleigh for Estate pieces. The stuff is unique and beautiful.