Exodus 39:10

He put them on the shoulder straps of the ephod, to be stones of memorial for the children of Israel, as the LORD commanded Moses.

He made the breastplate, the work of a skillful workman, like the work of the ephod: of gold, of blue, purple, scarlet, and fine twined linen.

It was square. They made the breastplate double. Its length was a span, and its width a span, being double.

and the second row, a turquoise, a sapphire, and an emerald;

and the third row, a jacinth, an agate, and an amethyst;

and the fourth row, a chrysolite, an onyx, and a jasper. They were enclosed in gold settings.