Parallel
Revelation 21:18
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Καὶ ἦν ἡ ἐνδόμησις τοῦ τείχους αὐτῆς ἴασπις· καὶ ἡ πόλις χρυσίον καθαρόν, ὅμοιον ὑέλῳ καθαρῷ.
The wall was made of jasper, and the city itself of pure gold, as pure as glass.