if you're afraid of it... discoloring the leather.. it won't. the hardware will tarnish, like twinkle said, it is polished brass and not gold.
This is 100% incorrect! If your lock tarnishes it can mark up light color surfaces, Such as Vachetta, White Multicolor Canvas, etc. You should try and keep your locks clean as tarnishing is the oxidation of brass - If you have ever wiped your locks with a white cloth, you know how much dirt, grease and other various elements have adhered to the surface over time.