Revelation 21:19

21:19 The foundations of the city’s wall are decorated with every kind of precious stone. The first foundation is jasper, the second sapphire, the third agate, the fourth emerald,

tn The perfect participle here has been translated as an intensive (resultative) perfect.

sn Agate (also called chalcedony) is a semiprecious stone usually milky or gray in color (L&N 2.32).