InvictaMen's 17882 Pro Diver Analog Display Swiss Quartz Black Watch

why is this called 18k gold when the pro diver 6983 does not (and invictas website does not mention 18k gold)?

can i order a new watchband ? where ?

I have watch invicta model 17882 only 2 month and the plastic band is broken, need buy other one, where?

does the gold plating fades away with the time or it's permanent?