This effect translates to additional weapon skill accuracy of 10% and an additional 0.1 added to the WSC value of weapon skill damage calculation (which would translate to approximately 10% damage for a weapon skill with a normally 1.0 WSC modifier).
This is, of course, provided that you are using the correct gorget with the weapon skill, e.g., Soil gorget for Rampage or Snow Gorget for Guillotine. Some weapon skills with multiple elements can get the same effect with different gorgets. Sidewinder, for example, has 3 possible weapon skill elements attached to it: Reverberation (Aqua gorget), Transfixion (Light gorget), and Detonation (Breeze gorget).