You'd need to see it in person, and/or take a piece of it along to a lighting shop -- probably either oil-rubbed bronze or black finishes would coordinate, but I can't tell which is closer from this photo.

Kearney 8-Light Chandelier, Vintage Black With Warm Brass · More Info

Troy Lighting Iliad 5-Light Pendant, Black/Nickel, F6215 · More Info

Merga 3-Light Oil Rubbed Bronze Wrought Iron Drum Cream White Shade Chandelier · More Info

Innovations 3 Light Fulton Chandelier in Oiled Rubbed Bronze, 207-OB-G172 · More Info

Yardley 3-Light Chandelier, Oil Rubbed Bronze · More Info

None of these is exactly right -- it's a tricky light to match, so you will probably have to come up with something that just echoes something about the pendant while going in a different direction.

If the fixture isn't part of a collection such that you can buy different variations on a theme easily, I find it's best to at least stay with the same manufacturer so that the finishes match. "Gun metal" and "coffee ombre" are going to mean different things to different manufacturers and in fact may not exist with other makers. But if the fixtures are far enough away from each other that no one can really make a direct comparison you can get close but not match and no one will notice. I think @acm has provided you with some good options that are thinking outside the box a bit.