Rose gold, known for its unique colour and durability, is less prone to tarnishing than metals like silver, but it can still discolour over time. The copper in rose gold can react with oxygen, particularly in humid conditions, leading to slight tarnishing.
Additionally, chemicals in cleaning agents, cosmetics, perfumes, and chlorine can accelerate this tarnishing, reacting with the gold and copper in the alloy. Body chemistry, such as sweat and oils, and environmental factors like humidity and pollution also play a role in the gradual tarnishing of rose gold.