Ex 28:15-22
“You shall make a breastpiece of judgment, in skilled work. In the style of the ephod you shall make it—of gold, blue and purple and scarlet yarns, and fine twined linen shall you make it. 16It shall be square and doubled, a spana its length and a span its breadth. 17You shall set in it four rows of stones. A row of sardius,b topaz, and carbuncle shall be the first row; 18and the second row an emerald, a sapphire, and a diamond; 19and the third row a jacinth, an agate, and an amethyst; 20and the fourth row a beryl, an onyx, and a jasper. They shall be set in gold filigree. 21There shall be twelve stones with their names according to the names of the sons of Israel. They shall be like signets, each engraved with its name, for the twelve tribes. 22You shall make for the breastpiece twisted chains like cords, of pure gold.
Commentary
Connection to the number of stones in the breastplate to the number of tribes of Israel. Connection to these 12 stones to the new temple in heaven Rev 21:19-20, connection to the garden of Eden Ez 28:11-14. This breaspiece is called the breastpiece of judgement, its symbolism had visual significance to the priests and the Israelites and was not a source of divination, the Bible is clear about evil practices such as witchcraft.
Leviticus 19:31 - Regard not them that have familiar spirits, neither seek after wizards, to be defiled by them: I am the LORD your God.
Leviticus 20:27 - A man also or woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones: their blood shall be upon them.
Gal 5:19-21
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, 20Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, 21Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.