Strong’s Greek
G4555 — sardinos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σάρδινος
sardinos — pronounced sar'-dee-nos
from the same as 4556; sardine (3037 being implied), i.e. a gem, so called:--sardine. see GREEK for 4556 see GREEK for 3037
1 occurrence in the KJV.
Revelation 4:3
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.