It's hard to quantify since rose gold isn't a pure color like blue is, but a blend of metals (copper and gold), which means the base color is kinda subjective. I've seen things labeled "rose gold" that range from a light tan color similar to champagne, to a light purple pink, and everything in between.

I personally lean more towards the champagne end of the spectrum when I think of rose gold, so in my opinion, the hexcode you picked for your base rose gold seems a little too purply, and I would put it closer to #B76E6E or maybe #C0816D.

In my mind "Navy" rose gold would be a deep coppery mauve.

Just eyeballing it, maybe It would be something close to #4F2E2E or #4F1E2F?