Exodus 39:6-10

And they wrought onyx stones inclosed in ouches of gold, graven, as signets are graven, with the names of the children of Israel.

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.

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.

It was foursquare; they made the breastplate double: a span was the length thereof, and a span the breadth thereof, being doubled.

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.