Exodus 39:11

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.

It was square. They made the breastplate double. Its length was a span, and its width a span, being double.

They set in it four rows of stones. A row of ruby, topaz, and beryl was the first row;

and the third row, a jacinth, an agate, and an amethyst;

and the fourth row, a chrysolite, an onyx, and a jasper. They were enclosed in gold settings.

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.