The crown jewels are often only used for the coronation of a monarch and a few other ceremonial occasions, though the monarch may also be often shown wearing them in portraits, as they symbolize the power and continuity of the monarchy. Since medieval times the crown jewels are typically passed down from one generation to the next. The royal "jewel box" might include crowns, sceptres, orbs, swords, and rings - all pieces usually in gold and heavily decorated with rare and precious stones, in styles which date back to the Middle Ages. These designs are normally very conservative. Many crown jewels are kept in a museum setting except when in use, and can be seen by the public.