an attractive and cheap jewel

trinket

a small ornament, piece of jewellery etc

trinket, gadget

an object used to add beauty or to decorate

decoration

a thing, event, of little value or importance; a small amount of money; (a portion of) a sweet dish made of cake with jam, jelly, cream etc; to treat a person, feeling lightly or insincerely

novelty item

an ornament or jewel of small value

knickknack