And the twelve gates - Revelation 21:12.
Were twelve pearls - See the Revelation 17:4 note; Matthew 13:46 note.
Every several gate was of one pearl - Each gate. Of course, this is not to be understood literally. The idea is that of ornament and beauty, and nothing could give a more striking view of the magnificence of the future abode of the saints.
And the street of the city was pure gold - Was paved with gold; that is, all the vacant space that was not occupied with buildings was of pure gold. See the notes on Revelation 21:18.