Exodus 28:9, 17-21

You shall take two onyx stones and engrave on them the names of the sons of Israel

You shall mount on it four rows of stones; the first row shall be a row of ruby, topaz and emerald; and the second row a turquoise, a sapphire and a diamond; and 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 stones shall be according to the names of the sons of Israel: twelve, according to their names; they shall be like the engravings of a seal, each according to his name for the twelve tribes.