Exodus 25:7

25:7 onyx stones, and other gems to be set in the ephod and in the breastpiece.

Exodus 28:6-12

28:6 “They are to make the ephod of gold, blue, purple, scarlet, and fine twisted linen, the work of an artistic designer. 28:7 It is to have two shoulder pieces attached to two of its corners, so it can be joined together. 28:8 The artistically woven waistband of the ephod that is on it is to be like it, of one piece with the ephod, of gold, blue, purple, scarlet, and fine twisted linen.

28:9 “You are to take two onyx stones and engrave on them the names of the sons of Israel, 28:10 six of their names on one stone, and the six remaining names on the second stone, according to the order of their birth. 28:11 You are to engrave the two stones with the names of the sons of Israel with the work of an engraver in stone, like the engravings of a seal; you are to have them set in gold filigree settings. 28:12 You are to put the two stones on the shoulders of the ephod, stones of memorial for the sons of Israel, and Aaron will bear their names before the Lord on his two shoulders for a memorial.

Leviticus 8:7

8:7 Then he put the tunic on Aaron, wrapped the sash around him, and clothed him with the robe. Next he put the ephod on him and placed on him the decorated band of the ephod, and fastened the ephod closely to him with the band.