You should check out this store in Northland Village Mall, its called "Jewel Shoppe." A few months ago my mom got her wedding ring upgraded to a larger diamond and a few of the settings changed. She is extremely pleased with the results, the customer service was excellentant and she got to talk to the master jeweller who does the work. Its a small shop so I think they are more eager for peoples business which means you could get a good deal.
Here is the link from northlands website
http://www.northlandvillagemall.ca/S...spx?StoreID=66
Also at northland is Tany's Jewelry.
Also, you should go to market mall (which is like 5 mins away from northland). They have an abundance of Jewelry stores: De Bearji Diamonds, Paris Jewellers, Peoples, Ann Louise Jewellers, Jewels by Maximes, Ben Moss, Mappins and Charm Diamond Centre.
Good luck!!