Onyx -Gemstones of the Bible
According to the Bible, Onyx is the middle gemstone in the fourth and last row of the High Priest’s breastplate (Exodus 28:20).
The Bible also states that the fifth foundational stone in New Jerusalem (Revelation 21:20), which is like the onyx, is called sardonux in the Greek
Onyx and Sardonyx stones are a variety of agates, which themselves are a variety of chalcedony.
In the near future, God the Father will place his presence and throne on the earth through a New Jerusalem he will create. One of the hallmark features of the new city will be its wall, which will contain twelve gemstones used for its foundations (Revelation 21:19 – 20).