#3095 יָהֲלֹם yahalom {yah-hal-ome'}

 from H1986 (in the sense of hardness); TWOT - 502b

—Hebrew Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a precious stone (known for its hardness)
    1a) perhaps the jasper, onyx, or diamond

—Brown-Driver-Briggs (Old Testament Hebrew-English Lexicon)

—Strong's (Hebrew & Chaldee Dictionary of the Old Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - diamond 3; 3

—Exhaustive Concordance (KJV Translation Frequency & Location)