Chalcedony

Revelation 21:19
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Blue Chalcedony
A precious stone, mentioned but once: it forms one of the foundations of the wall of the heavenly Jerusalem: it cannot be identified with any certainty (Rev. 21:1919And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald; (Revelation 21:19)).