.
'Tiffany and Co.' Provari guy is on Facebook, and does nice stuff, from what I've seen (no, I don't own one of these or know him personally). fwiw, I don't think he is claiming these have anything to do with Tiffany and Co., just that he matched the color.
Darren AKA 'OCD
mods' also does a lot of work on
mods, and has done a fair amount of Provaris. he's also on Facebook.
I don't know what the Tiffany and Co. guy uses, but iirc OCD uses cerakote and it's really strong. he's uploaded videos of keys being rubbed against
mods, trying to scratch them (spoiler: they don't scratch

).
regards.