Exodus 28:11
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.
Cross-reference
Exodus 28:13 gives the next instruction: make gold settings to mount the engraved stones from verse 11.
Exodus 28:14 describes braided gold chains attached to the settings for the engraved stones—part of the same ephod design.
Exodus 28:21 repeats the instruction to engrave names like a signet for the breastplate stones — paralleling the same technique for the ephod stones.
Exodus 28:25 fastens the chains to the settings on the ephod, completing the attachment of the engraved stones.
Exodus 28:36 commands engraving 'HOLINESS TO THE LORD' on a gold plate like a signet — same engraving method applied to a different item.
Exodus 28:17 also lists precious stones with tribal names, but on the breastpiece rather than shoulder stones — both serve as memorials for Israel.
Exodus 39:6 records the actual construction: onyx stones engraved like a signet, matching the instruction in Exodus 28:11.
Exodus 39:18 ties chains to the settings on the ephod, fulfilling the earlier instructions from Exodus 28:25 for the engraved stones.