佛說觀佛三昧海經 1.43

1.43

佛告父王：「云何名觀如來頂？如來頂骨團圓猶如合捲，其色正白，若見薄皮則為紅色，或見厚皮則金剛色，髮際金色，腦頗梨色。有十四脈眾畫具足，亦十四光其光如脈分明了了。於腦脈中旋生諸光上衝頭骨，從頭骨出乃至髮際，有十四色圍遶眾髮，髮下金色亦生眾光，入十四色中。是名如來生王宮中頂腦肉髻。惟其頂上五大梵相生，時摩耶及佛姨母皆悉不見。其五梵相開現光明至於梵世，復過上方無量世界，化成宮臺，諸佛境界，十地菩薩之所不見。

The Buddha addressed his father the king: "What is called contemplating the Tathāgata's crown? The Tathāgata's cranial bone is spherical, like a closed scroll; its color is pure white. If thin skin is seen, it appears red; or if thick skin is seen, it appears diamond-colored. The hairline is golden, and the brain is the color of crystal. It has fourteen veins completely endowed with manifold designs, and also fourteen lights, which lights are as distinct and clear as the veins. Within the brain veins, various lights arise swirling and surge upward against the skull, emerging from the skull up to the hairline; there are fourteen colors surrounding the mass of hair, and beneath the hair the golden color also produces manifold lights, which enter into the fourteen colors. This is called the cranial-brain uṣṇīṣa of the Tathāgata born in the royal palace. Only when the five great Brahma marks upon his crown arose, Māyā and the Buddha's maternal aunt both could not see them at all. Those five Brahma marks disclosed radiance reaching up to the Brahma realm, and further passing beyond the immeasurable worlds of the upper direction, transforming into palaces and platforms—the realm of the Buddhas, which Bodhisattvas of the Ten Stages cannot see.