Cross reference
Exodus 35:9
9 onyx stones, and stones to be set for the ephod and for the breastplate.
Exodus 25:5
5 rams' skins dyed red, sea cow hides, acacia wood,
Exodus 28:9
9 You shall take two onyx stones, and engrave on them the names of the children of Israel:
Exodus 28:17-21
17 You shall set in it settings of stones, four rows of stones: a row of ruby, topaz, and beryl shall be the first row;
18 and the second row a turquoise, a sapphire{or, lapis lazuli}, and an emerald;
19 and the third row a jacinth, an agate, and an amethyst;
20 and the fourth row a chrysolite, an onyx, and a jasper: they shall be enclosed in gold in their settings.
21 The stones shall be according to the names of the children of Israel, twelve, according to their names; like the engravings of a signet, everyone according to his name, they shall be for the twelve tribes.
Exodus 39:6-14
6 They worked the onyx stones, enclosed in settings of gold, engraved with the engravings of a signet, according to the names of the children of Israel.
7 He put them on the shoulder-pieces of the ephod, to be stones of memorial for the children of Israel, as Yahweh commanded Moses.
8 He made the breastplate, the work of a skillful workman, like the work of the ephod; of gold, of blue, purple, scarlet, and fine twined linen.
9 It was square. They made the breastplate double. Its length was a span, and its breadth a span, being double.
10 They set in it four rows of stones. A row of ruby, topaz, and beryl was the first row;
11 and the second row, a turquoise, a sapphire{or, lapis lazuli}, and an emerald;
12 and the third row, a jacinth, an agate, and an amethyst;
13 and the fourth row, a chrysolite, an onyx, and a jasper. They were enclosed in gold settings.
14 The stones were according to the names of the children of Israel, twelve, according to their names; like the engravings of a signet, everyone according to his name, for the twelve tribes.