And for your further edification:
At the present day two vessels are used to reserve the Blessed Sacrament: one, called a pyx, is a small round box and serves for carrying the Blessed Sacrament to the sick; the other, generally styled a ciborium, is used for distributing Holy Communion in churches and for reserving the consecrated particles in the tabernacle. In shape the ciborium resembles a chalice, but the cup or bowl is round rather than oblong, and provided with a conical cover surmounted by a cross or some other appropriate device. The bottom of the cup should be a little raised at the centre so that the last particles may be easily removed and the purification more conveniently performed. The material should be gold or silver (base metals are sometimes allowed), but the interior of the cup must be always lined with gold. The ciborium is not consecrated, but blessed by a bishop or some priest deputed by him, according to the form given in the Roman Ritual. While containing the Sacred Species it should be covered with small white veil of silk or cloth of gold, and may not be handled except by sacred ministers; when empty and purified it may be touched by all clerics (Cong. of Rites, Jan., 1907)