Strong's Definition
from the same as 3537 in the sense of striking fire from a metal forged; a sparkling gem, probably the ruby
KJV Usage: agate
STEPBible — Tyndale Abridged Hebrew Lexicon
כַּדְכֹּד (kad.kod) — ruby. a precious stone (maybe ruby, agate)
UBS Dictionary of Biblical Hebrew
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
כַּדְכֹּד n.[m.] a precious stone, perh. ruby base