Revelation 21:15-19

The angel who talked to me held in his hand a gold measuring stick to measure the city, its gates, and its wall. When he measured it, he found it was a square, as wide as it was long. In fact, its length and width and height were each 1,400 miles. Then he measured the walls and found them to be 216 feet thick (according to the human standard used by the angel). The wall was made of jasper, and the city was pure gold, as clear as glass. The wall of the city was built on foundation stones inlaid with twelve precious stones: the first was jasper, the second sapphire, the third agate, the fourth emerald