He made the breastpiece with the same workmanship as the ephod, 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.

Exodus 26:1
"You are to construct the tabernacle itself with ten curtains of finely spun linen, each with blue, purple, and scarlet yarn, and cherubim skillfully worked into them.

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 39:9
It was square when folded over double, a span long and a span wide.

And he made the breastplate of cunning work, like the work of the ephod; of gold, blue, and purple, and scarlet, and fine twined linen.