Exodus 39:6-8

Young's Literal Translation

⁶ And they prepare the shoham stones, set, embroidered [with] gold, opened with openings of a signet, by the names of the sons of Israel;

⁷ and he setteth them on the shoulders of the ephod -- stones of memorial for the sons of Israel, as Jehovah hath commanded Moses.

⁸ And he maketh the breastplate, work of a designer, like the work of the ephod, of gold, blue, and purple, and scarlet, and twined linen;