Originally(from what I read in the adds), the GOLD were/are "application specific"! Meaning, if your vehicle has semi-met's, the GOLD will be semi-met's for you app! If you have ceramic, the GOLD will be ceramic. I thought the GOLD were 3 layer shim from what I had read?
Originally(from what I read in the adds), the PLATINUM were strictly CERAMIC! Now, the WearEver PLAT's are either Plat's or Semi-Met's in "most apps". IDKY they started offering the Plat's in the semi-met's unless it's for the bit of more aggressive friction material for their TOP LINE PAD! I thought the PLAT's are 4 layer shim from what I had read?
OTOH, just to add this: The SILVERS were/are strictly Semi-Met's or ORGANIC(IDK what organic is)? And the Silvers have the lesser warranty.
Also my understanding is that, Semi-Met's have a better bite than Ceramic but, I've never been able to tell. I prefer Ceramic simply for the lack of noise(s) issue or Cold/Hot weather inconsistencies OR whatever! I've gone to ceramic pads and haven't looked back!