"They are to make the ephod of finely spun linen embroidered with gold, and with blue, purple, and scarlet yarn.
References for Exodus 28:6
It must have two shoulder pieces attached to its two edges so that it can be joined together.
The artistically woven waistband that is on the ephod must be of one piece, according to the same workmanship of gold, of blue, purple, and scarlet yarn, and of finely spun linen.
References for Exodus 28:8
"Take two onyx stones and engrave on them the names of Israel's sons:
six of their names on the first stone and the remaining six names on the second stone, in the order of their birth.
Engrave the two stones with the names of Israel's sons as a gem cutter engraves a seal. Mount them, surrounded with gold filigree settings.
Fasten both stones on the shoulder pieces of the ephod as memorial stones for the Israelites. Aaron will carry their names on his two shoulders before the Lord as a reminder.
Fashion gold filigree settings
and two chains of pure gold; you will make them of braided cord work, and attach the cord chains to the settings.