Exodus 28:17-21

17 a  You shall set in it four rows of stones. A row of sardius
The identity of some of these stones is uncertain
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.
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