Morrish Bible Dictionary
shamir. Ezekiel 3:9; Zechariah 7:12 . Though once translated 'diamond,' Jeremiah 17:1 , it is used symbolically of extreme hardness, 'harder than a flint.' The word is translated 'briars' and signifies any 'sharp point:' hence a diamond point, or anything hard.
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Morrish, George. Entry for 'Adamant'. Morrish Bible Dictionary. https://www.studylight.org/dictionaries/eng/mbd/a/adamant.html. 1897.