“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;”
King James Version (KJV)
21:19 And the foundations were adorned with precious stones - That is, beautifully made of them. The precious stones on the high priest's breastplate of judgment were a proper emblem to express the happiness of God's church in his presence with them, and in the blessing of his protection. The like ornaments on the foundations of the walls of this city may express the perfect glory and happiness of all the inhabitants of it from the most glorious presence and protection of God. Each precious stone was not the ornament of the foundation, but the foundation itself. The colours of these are remarkably mixed. A jasper is of the colour of white marble, with a light shade of green and of red; a sapphire is of a sky - blue, speckled with gold; a chalcedony, or carbuncle, of the colour of red - hot iron; an emerald, of a grass green.
Re 21:19,20 And the foundations of the wall of the city [were] garnished. They were adorned with precious stones. The twelve apostolic foundations present every spiritual grace and beauty. The various stones named are among the most precious known to the ancients.