Rhodium is often used to plate white gold jewelry. Because of the very bright and shiny nature of rhodium, it gives white gold a nice “pop.”
Rhodiumed rings look whiter and brighter. More often than not, white gold pieces of jewelry you see in jewelry stores have been rhodium plated. It’s the final step in lots of white gold jewelry. Again, it gives pieces the “pop” and “zing” that we like and come to expect.
Likewise, silver jewelry is frequently rhodium plated. Not only does this add shine and sparkle to the piece, but it helps in resisting tarnishing.
As you can imagine, rhodium plating is a relatively inexpensive way to turn a yellow gold piece of jewelry into a white gold piece of jewelry.