Exodus 28:18

“You shall make a breastplate of judgment, the work of the skillful workman; like the work of the ephod you shall make it; of gold, of blue, and purple, and scarlet, and fine twined linen, you shall make it.

It shall be square and folded double; a span shall be its length, and a span its width.

You shall set in it settings of stones, four rows of stones: a row of ruby, topaz, and beryl shall be the first row;

and the third row a jacinth, an agate, and an amethyst;

and the fourth row a chrysolite, an onyx, and a jasper. They shall be enclosed in gold in their settings.

The stones shall be according to the names of the children of Israel, twelve, according to their names; like the engravings of a signet, everyone according to his name, they shall be for the twelve tribes.