Exodus 28:15

You shall put the two stones on the shoulder straps of the ephod, to be stones of memorial for the children of Israel. Aaron shall bear their names before the LORD on his two shoulders for a memorial.

You shall make settings of gold,

and two chains of pure gold; you shall make them like cords of braided work. You shall put the braided chains on the settings.

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 second row a turquoise, a sapphire, and an emerald;