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Fausset's Bible Dictionary
("hyacinth".) A precious stone, a foundation of the New Jerusalem wall (Revelation 21:20). Hebrew leshem , "ligure" in the high priest's breast-plate (Exodus 28:19). A red zircon, found in square prisms, varying from pale green to purple red. "Ligure" in Speaker's Commentary is explained by "amber," which, according to Pliny and Theophrastus, came from Liguria. Smith's Bible Dictionary says "ligurite is a crystallized mineral of a yellowish or apple-green hue found in Liguria, 'jacinth' seems identical with Hebrew leshem) ." In Revelation 9:17 the "breast-plates of jacinth" are of hyacinth color, the dark blue iris color answering to the "smoke out of their mouths." Pliny says (37:41), the violet brightness in the amethyst is diluted in the jacinth. Solinus makes the,jacinth our sapphire.
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Fausset, Andrew R. Entry for 'Jacinth'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/j/jacinth.html. 1949.