Exodus 39:5-9

And the skillfully woven band of its overlay which was on it was like its workmanship, of the same material: of gold and of violet, purple, and scarlet material, and fine twisted linen, just as the Lord had commanded Moses.

They also made the onyx stones, set in gold filigree settings; they were engraved like the engravings of a signet, according to the names of the sons of Israel.

And he placed them on the shoulder pieces of the ephod as memorial stones for the sons of Israel, just as the Lord had commanded Moses.

And he made the breastpiece, the work of a skilled embroiderer, like the workmanship of the ephod: of gold and of violet, purple, and scarlet material and fine twisted linen.

It was square; they made the breastpiece folded double, a span long and a span wide when folded double.