Exodus 28:18
And the second row shall be an emerald, a sapphire, and a diamond.
Cross-reference
Exodus 39:11 records the actual making of the breastplate's second row with turquoise, sapphire, and emerald — identical to the instructions here.
In Exodus 24:10, sapphire forms the pavement under God's feet — the same stone on the breastplate, linking priestly garments to divine presence.
In Ezekiel 1:26, God's throne appears like sapphire — the same stone on the breastplate, linking the priestly garment to the heavenly throne.
In Ezekiel 10:1, the sapphire-like throne above the cherubim mirrors the breastplate's stone, connecting earthly worship to heavenly reality.
In Ezekiel 28:13, the king of Tyre is covered with many precious stones including sapphire, diamond, and carbuncle — matching the breastplate's row.