From what I understand the 'Magic Gold' used by Hublot is a mixture of Ceramic and 18K gold... to remain a hallmarkable precious metal... there has to be either 750 parts per thousand... ... then there is the Vickers measurement of strength... Golds around 140.... 316F is about 240 and MG is around a 1000..
This mix makes the metal unscratchable according to Hublot.... Thats why they used Rose gold before as the copper content makes gold harder... etc
Of course standard 18K gold is mixed as well to make it harder for everyday use as gold is soft... this is the same amount... ie 750 per 1000
The rep gold ceramic... and as far as I know there is only one model available using this currently.... Angus has it..
Here is link
http://puretime.co/product/big-bang-rose-gold-cf-black-dial-full-rg-ceramic/
This is a coloured through ceramic.... so basically they dont follow the part ratio above... they add say X% of the gold they use to plate other steel models... they mix this with the ceramic which when harden gives the ceramic a gold look either when brushed or polished.. Its much more resilient than plated steel but most importantly the gold doesnt wear off like the plated gold will do after periods of wear...
Both types in terms of colour are slightly off gen but I would defy 99.9% of the world to notice it on the wrist.... of course weight varies to the gen and would be an instant tell to anyone who knows how gold feels but again it wouldnt be that many...
I would prefer the RG ceramic personally....
The extent of the wear on SS plated is variable depending on factory version etc.. but with the ceramic.... you could double it treble it and on and on...
The gen Magic Gold looks almost fake... its weird when you look at it... its very cheap looking but at the same time very very blingy...
As for models... the Hublot site and gen forums discuss this extensively... but its only recent (Last couple of years)
