Could it be costume jewlery? Useful Website link(s)
https://www.vipartfair.org/most-valuable-costume-jewelry/
https://www.txantiquemall.com/sarah-coventr-jewelry/
https://heididaus.com/blogs/news/how-do-i-know-if-my-old-costume-jewelry-is-valuable
https://adirondackgirlatheart.com/antique-vintage-costume-jewelry-price-guide/
https://12tomatoes.com/miriam-haskell-costume-jewelry/
https://www.antique-jewelry-investor.com/identifying-costume-jewelry.html
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
https://heididaus.com/blogs/news
https://www.afashionblog.com/costume-jewelry-value/
https://financebuzz.com/vintage-valuable-jewelry?msockid=152ccceae02861253613d947e1c860ae
https://blog.worthy.com/knowledge-center/jewelry/how-to-identify-valuable-items-in-your-jewelry-box/
https://antiquesknowhow.com/vintage-brooches/
https://www.afashionblog.com/costume-jewelry/