Serendipitous has some of the best amber I've ever seen in Halifax. I bought a beautiful pendant with lots of inclusions (the particle formations), as well as a sturdy sterling silver chain to go with it. They also carry a wide assortment of gemstones and *bling* if amber isn't your thing. The staff here are very friendly and helpful, not pushy, and the prices are reasonable. You can find the shop inside the Farmer's Market complex.