Exodus 25:7

onyx stones and stones for mountings on the ephod and the breast piece.

Exodus 28:4

And these are the garments that they will make: A breast piece and an ephod and a robe and a tunic of specially woven fabric, a turban and a sash. And they will make holy garments for Aaron your brother, and for his sons to serve as priests for me.

Exodus 28:6-30

and they will make the ephod of gold, blue and purple, [and] crimson [yarns], and finely twisted linen, the work of a skilled craftsman.

Treasury of Scripture Knowledge

Summary

Onyx stones, and stones to be set in the ephod, and in the breastplate.

Ephod

General references

Bible References

Ephod

Exodus 28:4
And these are the garments that they will make: A breast piece and an ephod and a robe and a tunic of specially woven fabric, a turban and a sash. And they will make holy garments for Aaron your brother, and for his sons to serve as priests for me.

General references

Exodus 35:23
and every man with whom was found blue and purple and crimson [yarns] and fine linen and goat hair and red-dyed ram skins and fine leather brought [it].
Exodus 39:2
And he made the ephod [of] gold, blue, and purple and crimson [yarns], and finely twisted linen.