They were for a memorial before the LORD
This is from the King James Bible Exodus 28:21,29 & 30
21And the stones shall be with the names of the children of Israel, twelve, according to their names, like the engravings of a signet; every one with his name shall they be according to the twelve tribes.
29And Aaron shall bear the names of the children of Israel in the breastplate of judgment upon his heart, when he goeth in unto the holy place, for a memorial before the LORD continually.
30And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron's heart, when he goeth in before the LORD: and Aaron shall bear the judgment of the children of Israel upon his heart before the LORD continually.
The breastplate worn by priests in ancient times, as described in the Bible, consisted of 12 stones representing the 12 tribes of Israel. Each stone was associated with a different tribe and symbolized various attributes or characteristics. The stones were considered to bring divine protection and guidance to the wearer during religious ceremonies.
A military breastplate was a 'cuirass'
a breastplate is used to protect the internal organs, stomach, and the torso it was also used in the middle ages
Aegis.
The aegis
no you can not
The Breastplate of Aaron, described in the Book of Exodus, features twelve stones, each representing one of the twelve tribes of Israel. These stones are arranged in four rows of three and include: sardius, topaz, carbuncle, emerald, sapphire, diamond, jacinth, agate, amethyst, beryl, onyx, and jasper. Each stone is set in gold and symbolizes the tribes' names, serving as a reminder of their significance and God's covenant with them. The Breastplate was worn by the High Priest during religious ceremonies.
On average, about 2 - 2.5mm thick. However, the very centreline of the breastplate might be thicker, perhaps 3.5mm thick at most, and the edges of the breastplate at the sides might be as little as 1.0mm thick.
The breastplate of Zeus is called the Aegis. It is often described as a shield or a garment made of goatskin, and is associated with protection and power in Greek mythology.
What does Stone mean by the hidden stories in numbers
Breast as in breastplate.
breastplate of Zues