Exodus 28:15

12 And the two stones are to be placed on the ephod, over the arm-holes, to be stones of memory for the children of Israel: Aaron will have their names on his arms when he goes in before the Lord, to keep the Lord in mind of them.

13 And you are to make twisted frames of gold;

14 And two chains of the best gold, twisted like cords; and have the chains fixed on to the frames.

15 And make a priest's bag for giving decisions, designed like the ephod, made of gold and blue and purple and red and the best linen.

16 It is to be square, folded in two, a hand-stretch long and a hand-stretch wide.

17 And on it you are to put four lines of jewels; the first line is to be a cornelian, a chrysolite, and an emerald;

18 The second, a ruby, a sapphire, and an onyx;