The following is the results of your search for sardine stone.
Sardine Stone: (Revelation 4:3) R.V., "sardius;" Heb. 'odhem; LXX., Gr. sardion, from a
root meaning "red"), a gem of a blood-red colour. It was called
"sardius" because obtained from Sardis in Lydia. It is enumerated
among the precious stones in the high priest's breastplate
(Exodus 28:17; 39:10) It is our red carnelian.