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“Ad pulchritudinem tria requirunter:

integritas, consonantia, claritas”

“Three things are needed for beauty: wholeness, harmony, radiance.”
(as translated by “Stephen,” i.e., James Joyce.)

Or more simply integrity, consonance, clarity.

Note that the original is a bit longer, in St. Thomas Aquinas’ Summa Theologica:

Ad pulchritudinem tria requiruntur: Primo quidem integritas sive perfectio: quae enim diminuta sunt, hoc ipso turpia sunt. Et debita proportio sive consonantia. Et iterum claritas.