The locket and sword sort of have mixed Slytherin and Gryffindor colours. The Sword is silver with red rubies, and the locket is gold with green stones.
Idk how a sword would be gold (unless just the hilt was gold) because metal used to make swords, like steel and iron, are silver. Well, I guess it could be painted gold, buuuuut, paint can peel after a while.