Exodus 28:6

28:6 “They are to make the ephod of gold, blue, purple, scarlet, and fine twisted linen, the work of an artistic designer.

Exodus 39:7-8

39:7 He put them on the shoulder pieces of the ephod as stones of memorial for the Israelites, just as the Lord had commanded Moses.

The Breastpiece of Decision

39:8 He made the breastpiece, the work of an artistic designer, in the same fashion as the ephod, of gold, blue, purple, and scarlet, and fine twisted linen.