17th century alloys

We currently have in our posession a museum quality piece that is
from approximately the 17th century. It is European,has rose cut
diamonds, it clearly has a high copper alloy. I have been asked to
restore it and create a few new pieces that match the original
pieces as closely as possible. I am in need of assistance in finding
the alloying metals of the time to match the correct hue of the
gold. If you could provide a site or a person to contact to aide me
in my quest, I would greatly appreciate it. Thank you.

Richard L Jones
@Richard_L_Jones

I am in need of assistance in finding the alloying metals of the
time to match the correct hue of the gold. If you could provide a
site or a person to contact to aide me in my quest 

Hello Richard,

I amthe manufacturer of “AURA” Precious Alloys for the jewelry
manufacturing industry. This seems to be a topic of my interest and
I would be more than glad to offer my assistance to you, except
that, I am currently based in India on an assignment.

Please feel free to interact with my on my e-mail account directly
if you have any queries or questions. I will forward you more
details on hearing from you.

Regards
Nilesh Gupta.