Your jewelry is exposed to friction and stress every day, which wear it away. Eventually, the rhodium covering your white gold will also wear off, and the yellowish lower layer will become visible. You can slow down this process by wearing your jewelry less often, but sooner or later your white gold will turn yellow.
How can I tell what carat of gold my ring is?
Jewelry which was manufactured in Europe, might be marked with numbers that represent the gold content, such as 585 for 14k gold, and 750 for 18k gold. If the ring is stamped with one of these alloy marks and is white in color, then it is probably white gold, and if it’s yellow in color it is yellow gold.