Arcana Coelestia #9862
9862. 'A span the length of it, and a span the breadth of it' means equally in respect of good and in respect of truth. This is clear from the meaning of 'the length' as good, dealt with in 1613, 9487; and from the meaning of 'the breadth' as truth, dealt with in 1613, 3433, 3434, 4482, 9487. Equally in respect of both these is meant by the length and the breadth, that they were equal.
Revelation 21:19-20
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The foundations of the city's wall were adorned with all kinds of precious stones. The first foundation was jasper; the second, sapphire; the third, chalcedony; the fourth, emerald;
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the fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, topaz; the tenth, chrysoprasus; the eleventh, jacinth; and the twelfth, amethyst.