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Kitto's Popular Cyclopedia of Biblical Literature
Sapphire, a precious stone, mentioned in;;;; . It is next in hardness and value to the diamond, and is mostly of a blue color of various shades. It is often found in collections of ancient gems.
Kitto, John, ed. Entry for 'Sapphire'. "Kitto's Popular Cyclopedia of Biblical Literature". https://www.studylight.org/encyclopedias/eng/kbe/s/sapphire.html.