Rev Revelation, chapter Revelation of Jesus Christ, chapter 21
John described the composition of the city, its wall, its foundations, its gates, and its street, emphasizing the great value of each part.
Revelation 21:18-27
The twelve gates of the city were something like huge pearls. Each gate was like it was a single pearl. The ground of the main plaza of the city (OR, The streets of the city) appeared to be pure gold that looked like clear glass.