Breastplate for the High Priest: Materials of
Source: TTT
Exodus 28:15
You are also to make a breastpiece of judgment with the same workmanship as the ephod. Construct it with gold, with blue, purple, and scarlet yarn, and with finely spun linen.
Exodus 39:8
He made the breastpiece with the same workmanship as the ephod, with gold, with blue, purple, and scarlet yarn, and with finely spun linen.