Can a necklace give you bruise on your neck if wear it too long?

Yes, wearing a necklace for an extended period of time can cause a bruise on your neck. This is because the necklace puts pressure on the skin and blood vessels in your neck, which can cause the blood vessels to break and form a bruise. The severity of the bruise will depend on the weight of the necklace and the length of time it is worn. Some metals, such as copper or brass, have a higher chance of leaving a green hue than silver or gold due to the metal reacting with your skin's pH as well.

To avoid getting a bruise, it is recommended to take breaks from wearing your necklace throughout the day and to not wear it for too long at once. As such, remove your necklace as soon as you notice bruising to prevent it from worsening. Also, if you have sensitive skin, consider wearing necklaces made of hypoallergenic materials and opt for lightweight options when needed. Additionally, If you develop any discoloration after removing the necklace, consult a physician, especially if the appearance does not start to reduce in time.