Exodus 39:11 Midrash

וְהַטּ֖וּר הַשֵּׁנִ֑י נֹ֥פֶךְ סַפִּ֖יר וְיָהֲלֹֽם׃

And the second row, a carbuncle, a sapphire, and an emerald.

Read midrashic interpretation of Exodus 39:11: and classical rabbinic exegesis.