Revelation 21:16, 19-21
The city was laid out like a square, as long as it was wide.
He measured the city with the rod and found it to be
12,000 stadia* in length, and as wide and high as it is long. . . .
The foundations of the city walls were decorated with every kind of precious stone.
The first foundation was jasper, the second sapphire,
the third chalcedony, the fourth emerald, the fifth sardonyx,
the sixth carnelian, the seventh chrysolite, the eighth beryl,
the ninth topaz, the tenth chrysoprase, the eleventh jacinth, and the twelfth amethyst.
The twelve gates were twelve pearls, each gate made of a single pearl.
The great street of the city was of pure gold, like transparent glass.
~ New International Version ~
* (about 1,400 miles)