If you mislay your bijou bijous you could say that have a bijou problemette.
The word bijou can mean small and elegant (of a residence – often ironic),
intricate or finely made, or a jewel, a piece of jewellry; a trinket or a small intricate piece of metalwork. In the above sentence bijou bijous means ‘finely made jewelery’, and a bijou problemette means ‘a little problem’, an example of British understatement.
Bijou, as jewellery, comes from the French bijou (a piece of jewellery), from the Breton bizoù (ring), from biz (finger), from the Proto-Celtic *bistis (finger) [source].
Bijou, as in small and elegant, etc, comes from the Mediterranean Lingua Franca (Sabir) bijou, from the Occitan pichon (small, little), from the Late Latin pitinnus, possibly from Proto-Celtic *kʷezdis (piece, portion) [source], which is also the root of peth (thing, object) in Welsh, cuid (part portion) in Irish, and related words in other Celtic languages.