4k gold is an alloy of gold that consists of 75% gold and 25% other metals. When the surface of the metal gets wet or comes in contact with external elements, it causes tarnishing. Hence, it can leave a dull or uneven appearance. To prevent tarnishing, taking care of and maintaining your jewellery and accessories is crucial. With proper care and maintenance, your 4k gold jewellery should not tarnish, and you can enjoy its brilliant shine and lustre for years to come.