Sardius

It was believed to prevent unpleasant dreams, to make its possessor wealthy, and to sharpen the wit.

Sardius appears 4 times in the Scripture.
It was one of the jewels in the first row of the high priest’s breastplate.

Exodus 28:17 And 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 39:10 And they set in it four rows of stones: the first row was a sardius, a topaz, and a carbuncle: this was the first row.
Ezekiel 28:13 Thou 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.
Revelation 21:20 The fifth, sardonyx; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.

⇛ checkout List of Topics