The most beautiful and precious moment for a Catholic Christian is every time the Host and Chalice is transformed into the Body and Blood of Our Lord. When the Host is elevated, we adore and love the One who loved us and gave Himself up for us. The beauty of this moment is encapsulated especially well in the traditional Solemn Pontifical Mass of the Latin Church.
(At the top is the Celebrant, here a Bishop, to his left and right the Assistant Priest and Deacon, resp., and below them the Subdeacon flanked by the Assistant Deacons. Sober, dignified, not over-elaborate. In the post-1970 liturgy, on the occasion of such a Mass the sanctuary would be overcrowded with Priests in chasubles up to no good.)