16. The chest covering must be square—nine inches long and nine inches wide—and folded double to make a pocket.
17. Put four rows of beautiful gems on the chest covering: The first row must have a ruby, topaz, and yellow quartz;
18. the second must have turquoise, a sapphire, and an emerald;
19. the third must have a jacinth, an agate, and an amethyst;
20. the fourth must have a chrysolite, an onyx, and a jasper. Put gold around these jewels to attach them to the chest covering.