George Leo Haydock, on Tob 13:21

“The gates of Jerusalem shall be built of sapphire, and of emerald, and all the walls thereof round about of precious stones.”

“Emerald. Greek adds, “and precious stone: thy walls, and towers, and battlements, of pure gold. And the streets of Jerusalem shall be strewed with beryl and carbuncle, and stone from Soupheir.” (Haydock) — This description resembles that of Isaias, (liv. 11.) who lived a little before. St. John (Apocalypse xxi.10.) represents the church in the same ornaments, denoting the merits of Christ and the virtues of his saints. All are convinced that such expressions are not to be taken in the literal sense. (Calmet)”

Imported from an open dataset — not yet checked against the printed edition.