Exodus 39:8-12

And he made the breastpiece, the work of a skilled embroiderer, like the workmanship of the ephod: of gold and of violet, purple, and scarlet material and fine twisted linen.

It was square; they made the breastpiece folded double, a span long and a span wide when folded double.

And they mounted four rows of stones on it. The first row was a row of ruby, topaz, and emerald;

and the second row, a turquoise, a sapphire, and a diamond;

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