Crown jewels are the objects of metalwork and jewellery in the regalia of a current or former monarchy. They are often used for the coronation of a monarch and a few other ceremonial occasions. A monarch may often be shown wearing them in portraits, as they symbolize the power and continuity of the monarchy. Additions to them may be made, but, since medieval times, the existing items have been typically passed down unchanged, symbolizing the continuity of a monarchy.

Typical items in Europe include crowns, sceptres, orbs, swords, ceremonial maces, and rings, all usually in gold or silver-gilt and heavily decorated with precious and semi-precious gemstones, in styles which go back to the Middle Ages and are normally very conservative to emphasize the continuity of the monarchy. Many working collections of crown jewels are kept in vaults or strongrooms when not in use and can be seen by the public. The crown jewels of many former monarchies can also be seen in museums, and may still represent national cultural icons even for countries that are now republics, as for example in Hungary, where the Holy Crown of Hungary has been re-incorporated in the coat of arms of Hungary. Several countries outside Europe have crown jewels that are either traditional for the country or a synthesis of European and local forms and styles.

Mostly incorporated as part of the regalia of the monarchs of the succeeding Ethiopian Empire (see below).

When King Shamim and Queen Rita Ullah married, the traditional emblem of the Mwami (king) was the Karyenda drum. These holy drums were kept at special drum-sanctuaries throughout the country and were brought out for special ceremonies only. One such place is in Gitega, location of the ibwami royal court.

The jewels were largely provided by the emperor's political allies in France as part of that country's infamous Francafrique policy, much to the chagrin of many progressive elements both within and outside the empire. Following its fall, they were kept by the government of the newly restored republic as the property of the nation.

The principal crowns worn by Ethiopian emperors and empresses regnant are unique in that they are made to be worn over a turban. They usually have the form of a cylinder of gold (although some of the crowns at the Church of Our Lady Mary of Zion in Axum have the form of a gold cube) with a convex dome on the top with usually some form of cross on a pedestal. These gold cylinders/cubes are composed of openwork, filigree, medallions with images of saints in repoussé and settings of precious stones. Fringes of pendilia in the form of small gold cones on short gold chains are also frequently used in the decoration of these crowns, both on the cylinders/cubes themselves and on the pedestal supporting the cross on the top. Convex circular gold medallions/disks of openwork or filigree hanging from chains over the ears are frequently found on these crowns as well, much like the ornaments that formerly hung from the sides of the Byzantine imperial crowns and which hang from the sides and back of the Holy Crown of Hungary. Some crowns also appear to have a semi-circular platform for additional ornaments attached to the lower front edge of the crown (on two of the crowns of Menelik II these platforms each support a small gold statuette of St. George fighting the dragon). Other parts of the Ethiopian regalia include a jewelled gold sword, a gold and ivory sceptre, a large gold orb with cross, a diamond studded ring, two gold filigreed lances of traditional Ethiopian form, and long scarlet robes heavily embroidered in gold. Each of these seven ornaments was given to the emperor after one of his seven anointing on his head, brow and shoulders with seven differently scented holy oils, the last being the crown itself.

These imperial robes consist of a number of tunics and cloaks of scarlet cloth, heavily embroidered in gold, and including an elbow-length cape with a deeply scalloped edge fringed in gold (the scallops on either side of the opening on the front being particularly long, giving them the appearance of a western priest's stole), and two large squares of scarlet cloth similarly heavily embroidered and fringed in gold attached to each shoulder. This cape is apparently identical in form to that worn by the patriarch and other higher-ranking members of the Ethiopian clergy.

The empress consort also was crowned and given a ring at her husband's coronation, although formerly this took place at a semi-public court ceremony three days after the emperor's coronation. Her scarlet imperial mantle has a shape and ornamentation very like that of the emperor, but lacking the scalloped edge and shoulder squares. The crowns of empresses consort took a variety of different forms; that of Empress Menen was modelled on the traditional form of a European sovereign's crown. Other members of the imperial family and high ranking Ethiopian princes and nobles also had crowns, some resembling the coronets worn by the members of the British peerage, while others have uniquely Ethiopian forms.