Joseph's stone was the onyx, that has the virtue of endowing him who wears it with grace, and truly, by his grace, did Joseph find favor in the eyes of all.
Jasper was Benjamin's stone, and as this stone turns color, being now red, now green, now even black, so did Benjamin's feelings vary to his brothers. Sometimes he was angry with them for having sold into slavery Joseph, the only other brother by his mother Rachel, and in this mood he came near betraying their deed to his father; but, that he might not disgrace his brothers, he did not divulge their secret. To this discretion on his part alludes the Hebrew name of his stone, Yashpeh, which signifies, "There is a mouth," for Benjamin, though he had a mouth, did not utter the words that would have covered his brothers with disgrace.