First time using gold - help!

[Emmawykes]

Hello,

I’ve been asked to make a gold wedding band and since I’ve never worked with gold before I have a few questions..

The customers engagement ring is 18ct but would like the wedding ring 9ct, would that be a problem if they’re worn together?

Also, she would like the ring a dull gold opposed to shiny yellow (please see photograph) - how would I go about this?

Thank you in advance!

Emma