John the Apostle
Revelation 21:19KJV·traditional attribution

And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;

Matthew Henry Presbyterian

We have already considered the introduction to the vision of the new Jerusalem in a more general idea of the heavenly state; we now come to the vision itself, where observe, I. The person that opened the vision to the apostle - one of the seven angels, that had the seven vials full of the seven last plagues, Rev 21:9.

Commenting on Revelation 21:9-27

John Gill Reformed Baptist

The fifth, sardonyx,.... Which is partly of the sardian, and partly of the onyx stone, which resembles a man's nail, from whence it has its name; it is reddish, bordering on white; it may be thought to answer to the onyx in the breastplate, on which was written the name of Joseph.

Albert Barnes Presbyterian

Verse 19. And the foundations of the wall of the city. . Were garnished. Were adorned, or decorated. That is, the foundations were composed of precious stones, giving them this highly ornamented and brilliant appearance. The first foundation. The first row, layer, or course. Barnes on "Re 21:14". Was jasper. . The second, sapphire. This stone is not elsewhere mentioned in the New Testament.