Oh no i would only let Leon do it!
He is on holidays now so was just curious if it could be done.
Also, does millegrain make stones look closer together?
My friend got exact same ring from him but with millegrain and it looks different.
Unless the design is extremely intricate with unusual edges, I am of the understanding that millgrain can be added on at any point post-production. It does get banged up though - my Leon millgraining has a few uneven places that hopefully he can repair at some point in the future, when I'm back in the States.
I think that millegrain requires a certain width of blank metal to be grained, so a slightly slimmer non millegrain version of a piece may not be able to be grained. I'm sorry Leon said no.