Vintage jewelry in the hair, worn as Liz Taylor would have, is fancy and glamorous:
Worn modern style, it’s just a fun and pretty look.
Pinning the brooch to a ribbon is an easy way to add some sparkle.
They look great on short hair, too:
In all of these styles, the brooch is not actually holding the hair; there’s something else, like a clip or a bobby pin doing that job. The brooches are just a bit of added sparkle.