Strong's Concordance

Original word: σάρδιος
Transliteration: sardion
Definition (short): sardius
Definition (full): sard, a sardian (stone)

NAS Exhaustive Concordance

Word Origin: of uncertain origin
Definition: sard, a sardian (stone)
NASB Translation: sardius (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Properly, an adjective from an uncertain base; sardian (lithos being implied), i.e. (as noun) the gem so called -- sardius.
KJV: And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald.
NASB: And He who was sitting was like a jasper stone and a sardius in appearance; and there was a rainbow around the throne, like an emerald in appearance.
KJV: The fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.
NASB: the fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, topaz; the tenth, chrysoprase; the eleventh, jacinth; the twelfth, amethyst.