sardius

Concise Bible Dictionary:

One of the precious stones in the breastplate (Ex. 28:1717And thou shalt set in it settings of stones, even four rows of stones: the first row shall be a sardius, a topaz, and a carbuncle: this shall be the first row. (Exodus 28:17); Ex. 39:1010And they set in it four rows of stones: the first row was a sardius, a topaz, and a carbuncle: this was the first row. (Exodus 39:10)). It also embellished one of the foundations of the holy Jerusalem (Rev. 21:2020The 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. (Revelation 21:20)). It was one of the stones that covered the king of Tyrus—doubtless portraying Satan before his fall (Ezek. 28:1313Thou hast been in Eden the garden of God; every precious stone was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship of thy tabrets and of thy pipes was prepared in thee in the day that thou wast created. (Ezekiel 28:13)). In heaven One who sat upon the throne was “to look upon like a jasper and a sardine stone” (Rev. 4:33And 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. (Revelation 4:3)). It is supposed to be the sard, a superior variety of agate, of various colors, some blood-red, and others of a golden hue.

Strong’s Dictionary of Greek Words:

Number:
4556 (find all occurrences in KJV Bible)
Greek:
σάρδιος
Transliteration:
sardios
Phonic:
sar’-dee-os
Meaning:
properly, an adjective from an uncertain base; sardian (3037 being implied), i.e. (as noun) the gem so called
KJV Usage:
sardius

Jackson’s Dictionary of Scripture Proper Names:

ruddiness