#5472 χαλκηδών chalkedon {khal-kay-dohn'}

 from G5475 and perhaps G1491; TDNT - n/a; n m

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

 1) chalcedony is a precious stone of misty grey colour, clouded with
    blue, yellow, or purple

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

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

 AV - chalcedony 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)