Costume jewellery is relatively an inexpensive form of jewellery as it does not contain any precious gemstone and is affordable by most people. They are the perfect substitute for real jewellery pieces as they are gold plated and contain semi-precious stones to give a look just as good as that of real jewellery. People nowadays prefer buying costume jewellery rather than investing their money in fine jewellery as they can have a huge variety of jewellery and that too within their stipulated budget.
Source: https://www.quora.com/Who-are-the-best-costume-jewelry-manufacturers/answer/Harsh-Garg-59