Exodus 39:6
“And they wrought onyx stones inclosed in ouches of gold, graven, as signets are graven, with the names of the children of Israel.”
They made shoulderpieces for it, to couple it together: by the two edges was it coupled together.
And the curious girdle of his ephod, that was upon it, was of the same, according to the work thereof; of gold, blue, and purple, and scarlet, and fine twined linen; as the Lord commanded Moses.
And they wrought onyx stones inclosed in ouches of gold, graven, as signets are graven, with the names of the children of Israel.
And he put them on the shoulders of the ephod, that they should be stones for a memorial to the children of Israel; as the Lord commanded Moses.
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.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And thou shalt take two onyx stones, and grave on them the names of the children of Israel:”
“With the work of an engraver in stone, like the engravings of a signet, shalt thou engrave the two stones with the names of the children of Israel: thou shalt make them to be set in ouches of gold.”
“And thou shalt put the two stones upon the shoulders of the ephod for stones of memorial unto the children of Israel: and Aaron shall bear their names before the Lord upon his two shoulders for a memorial.”
“And onyx stones, and stones to be set for the ephod, and for the breastplate.”
“It cannot be valued with the gold of Ophir, with the precious onyx, or the sapphire.”