If a tree looks gold on one side and silver on the other, the fix may be as simple as moving three ornaments. Stand where you usually see the whole tree. Pick one metal to carry from top to bottom and let the second appear in smaller pockets.
Give the smaller ornaments a job
Wire or hang mini gold mercury glass ornaments individually where the greenery opens up near the front. For a broad branch, hang a few at different depths so you can still see their outlines. Then run the mini silver mercury glass garland in a few shallow curves. Let some of it disappear behind the branch tips; the little flashes of silver will connect the gold across the tree.
Check the reflections after dark
Place a mercury glass ornament cluster where it has space below the branch. Switch on your usual evening lighting and walk past. If all the shine seems to sit in one spot, shift the cluster a branch or two. A length of faux pearl and gold wire garland introduces a softer finish where two bright sections meet.
See Gilded Starlight for ornaments that share those finishes. To work inherited character ornaments into the same tree, take a look at A Very Vintage Holiday.
Bring in an heirloom with a different finish
An old silver bell or a single brass ornament can look quite at home on a mixed-metal tree. Hang it near a patch of plain greenery and put a smaller ornament in a related finish one branch away. If the heirloom has darkened with age, try a spot nearer the front where light reaches its outline. The slight difference in finish is what makes that part of the tree worth a closer look.
Explore two more Christmas looks from Rust & Cinder with Christmas at the Lodge and Merry & Bright Christmas.