Wedding colour advice.

The colour palette seems coordinated well to make the range work well together and shades to pop out well. The grey being lighter would be a great contrast to the darker shades of the gold and eucalyptus décor.

Since eucalyptus is greenery, it really acts as a neutral rather than a colour. Same goes for gold accents unless you're using it in a lot of the decor. I think the blush goes with your theme no question. I also think the grey would look nice, but I agree with Hank that a slightly lighter grey might be a better idea. It's hard to tell on a screen. If you can order a fabric swatch it might be easier to tell whether it will be too dark or the wrong tone.

The grey tones would match the mountains, giving it a nice rustic aesthetic while the blush would allow the girls to stand out a tad more in front of the mountains due to the contrast. It's also easier for men to work with grey when picking their outfits to coordinate. Since you're doing a summer rustic wedding, I personally suggest a slightly lighter grey as it's less somber and could brighten up the look if your day happens to take place during a typical Alberta overcast. But really, you can't go wrong either way.

Your gold setting goes with anything and both bridesmaids and groomsmen can easily wear accessories with a yellow gold look like bracelets, watches, earrings, necklaces, etc to tie them together.

If you want to explore other colours, try earthy colours like olive or deep green, burgundy and browns.