Daniel
Daniel 10:6BSB·traditional attribution

His body was like beryl, his face like the brilliance of lightning, his eyes like flaming torches, his arms and legs like the gleam of polished bronze, and his voice like the sound of a multitude.

Matthew Henry Presbyterian @wholebiblehenry

This vision is dated in the third year of Cyrus, that is, of his reign after the conquest of Babylon, his third year since Daniel became acquainted with him and a subject to him. Here is, I. A general idea of this prophecy (Dan 10:1): The thing was true; every word of God is so; it was true that Daniel had such a vision, and...

Commenting on Daniel 10:1-9

John Gill Reformed Baptist @doctorgill

His body also was like the beryl,.... That is, that part of it which was not covered with the linen garment, and was seen, was like such a precious stone, said to be of an azure and sky colour, signifying he was the Lord from heaven; though, according to its name, it should be of a sea colour, greenish; and so, according to some, the beryl is.

Jamieson-Fausset-Brown Reformed @jfbcommentary

beryl--literally, "Tarshish," in Spain. The beryl, identical with the chrysolite or topaz, was imported into the East from Tarshish, and therefore is called "the Tarshish stone."