It's generally advisable to avoid wearing a necklace in the shower. Exposing your necklace to water, soap, and shampoo can cause damage over time, particularly if it's made of delicate materials or contains gemstones. Water can weaken the metal, leading to potential breakage or tarnishing. Additionally, the chemicals in soaps and shampoos may negatively affect the appearance and longevity of your necklace. It's best to remove your necklace before showering or swimming to preserve its beauty and condition.