The gold is worn off on some of the designs on the right side of my Browning 625 receiver. How can this be restored?

Browning 625 Golden Clays Price: $2,700 Manufacturer: Browning Model: 625 Golden Clays Gauge: 12 Barrel Length: 30” LOP: 14”; the trigger shoe is adjustable (forwards/backwards) Adjustable comb – installed by Tronspace Adjustable butt plate with Kickeez pad – installed by Tronspace Browning...