I always look at what type of chain comes with any pendant I buy.  If it's not a box chain, I immediately go to Silver Speck and order a box chain.  Box chains always seem to be the strongest and most secure.  When it comes to great quality, great deals, and great service for silver, I have never been disappointed by Silver Speck.  RE: chains, I can find any kind of chain in any length at Silver Speck for an amazing price.  Highly recommended!!