Regalia (Crown Jewels) usually consist of one or several crowns (King, consort, heir, etc.), and other pieces like a sword, a sceptre, an orb - old symbols of power.
Family jewels are quite antoher thing. They can be grand necklaces, tiaras, ear-rings, etc. etc.
These are "goverened" by the personl owners, of wills of previous owners, of family foundations, of personal beqests, of state foundations and a variety of other lagal solutions.