Exodus 39:3-7

3They hammered out thin sheets of gold and cut threads from them to interweave with the blue, purple, and scarlet yarn, and fine linen—the work of a skilled craftsman. 4They made shoulder pieces for the ephod, which were attached at two of its corners, so it could be fastened. 5And the skillfully woven waistband of the ephod was of one piece with the ephod, of the same workmanship—with gold, with blue, purple, and scarlet yarn, and with finely spun linen, just as the LORD had commanded Moses.

6They mounted the onyx stones in gold filigree settings, engraved like a seal with the names of the sons of Israel. 7Then they fastened them on the shoulder pieces of the ephod as memorial stones for the sons of Israel, as the LORD had commanded Moses.