Revelation 21:17-21

17The angel measured the wall using human measurement, and it was 144 cubits That is, about 200 feet or about 65 meters thick. Or high 18The wall was made of jasper, and the city of pure gold, as pure as glass. 19The foundations of the city walls were decorated with every kind of precious stone. The first foundation was jasper, the second sapphire, the third agate, the fourth emerald, 20the fifth onyx, the sixth ruby, the seventh chrysolite, the eighth beryl, the ninth topaz, the tenth turquoise, the eleventh jacinth, and the twelfth amethyst. The precise identification of some of these precious stones is uncertain.

21The twelve gates were twelve pearls, each gate made of a single pearl. The great street of the city was of gold, as pure as transparent glass.