Exodus 39:9

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.