Exodus 28:15-21

“You are to make a breastpiece of judgment, the work of a skilled and talented craftsman; like the work of the ephod you shall make it: of gold, of blue, purple, and scarlet fabric and of fine twisted linen. The breastpiece shall be square and folded double; a span [about nine inches] in length and a span in width. You shall mount on it four rows of stones: the first row shall be a row of ruby, topaz, and emerald; the second row a turquoise, a sapphire, and a diamond; the third row a jacinth, an agate, and an amethyst; and the fourth row a beryl and an onyx and a jasper; they shall be set in gold filigree. The [engraved] stones shall be twelve, according to the names of [the twelve tribes of] the sons of Israel; they shall be like the engravings of a signet, each with its name for the twelve tribes.