Exodus 39:9 KJV
It was foursquare; they made the breastplate double: a span was the length thereof, and a span the breadth thereof, being doubled.
Exodus 39:7–11 KJV Chapter Context
7
And he put them on the shoulders of the ephod, that they should be stones for a memorial to the children of Israel; as the LORD commanded Moses.
8
And he made the breastplate of cunning work, like the work of the ephod; of gold, blue, and purple, and scarlet, and fine twined linen.
9
It was foursquare; they made the breastplate double: a span was the length thereof, and a span the breadth thereof, being doubled.
10
And they set in it four rows of stones: the first row was a sardius, a topaz, and a carbuncle: this was the first row.
11
And the second row, an emerald, a sapphire, and a diamond.