Revelation 21:21 And the twelve gates were twelve pearls ...
Verse 21. - And the twelve gates were twelve pearls; every several gate was of one pearl.The pearl was known to the ancients from the earliest times, and was always held in high honour by them (cf. Revelation 17:4). And the street of the city was pure gold, as it were transparent glass (cf. ver. 18). The brilliancy was so far beyond ordinary gold as to make it apparently transparent like glass.