Exodus 39:13 (KJV)

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.

And the second row, an emerald, a sapphire, and a diamond.

And the third row, a ligure, an agate, and an amethyst.

And the stones were according to the names of the children of Israel, twelve, according to their names, like the engravings of a signet, every one with his name, according to the twelve tribes.

And they made upon the breastplate chains at the ends, of wreathen work of pure gold.

And they made two ouches of gold, and two gold rings; and put the two rings in the two ends of the breastplate.

And they put the two wreathen chains of gold in the two rings on the ends of the breastplate.

And the two ends of the two wreathen chains they fastened in the two ouches, and put them on the shoulderpieces of the ephod, before it.