Issachar's stone was the sapphire, for this tribe devoted themselves completely to the study of the Torah, and it is this very stone, the sapphire, out of which the two tables of the law were hewn. This stone increases strength of vision and heals many diseases, as the Torah, likewise, to which this tribe was so devoted, enlightens the eye and makes the body well.
The white pearl is the stone of Zebulun, for with his merchant ships he sailed the sea and drew his sustenance from the ocean from which the pearl, too, is drawn. The pearl has also the quality of bringing its owner sleep, and it is all the more to the credit of this tribe that they nevertheless spent their nights on commercial ventures to maintain their brother-tribe Issachar, that lived only for the study of the Torah. The pearl is, furthermore, round, like the fortune of the rich, that turns like a wheel, and in this way the wealthy tribe of Zebulun were kept in mind of the fickleness of fortune.