Ephod: A Sacred Vestment Worn by the High Priest: Described
Source: Nav
Exodus 28:6–14, 31–35
They are to make the ephod of finely spun linen embroidered with gold, and with blue, purple, and scarlet yarn. / It shall have two shoulder pieces attached at two of its corners, so it can be fastened. / And the skillfully woven waistband of the ephod must be of one piece, of the same workmanship—with gold, with blue, purple, and scarlet yarn, and with finely spun linen.
Exodus 25:7
and onyx stones and gemstones to be mounted on the ephod and breastpiece.