Exodus 25:7 lists onyx stones as materials for the ephod; here they are mounted as commanded.

Exodus 28:9 commands engraving two onyx stones with Israel's names; this verse executes that command.

Exodus 35:9 lists onyx stones from the people's offerings for the ephod; here they are used in construction.

Exodus 28:11 commands engraving the onyx stones with names — here that command is carried out.

Exodus 28:12 instructs setting these stones on the ephod's shoulders — the stones are being prepared for that purpose.