NOTE: There are two ways to get set bonuses with this set...

1. If you wear all three rings and the weapon you will get the first THREE of the bonuses listed below

2. If you socket ALL three set rings INTO the weapon you will ALSO get the fourth set bonus listed below

So clearly if you are looking to get the bonuses for wearing a complete set you should socket the rings into the weapon before wearing them so that you can get the additional secret bonus.