18 Coral and crystal cannot be mentioned with it; A pouch of wisdom is better than rubies.
ra-MOT v’-ga-VEESH LO yi-za-KHAYR u-ME-shekh khokh-MAH mi-p’-nee-NEEM
יח רָאמוֹת וְגָבִישׁ לֹא יִזָּכֵר וּמֶשֶׁךְ חָכְמָה מִפְּנִינִים׃
28:18 A pouch of wisdom is better than rubies
In several places, the Bible uses the ruby as an example of something precious. Sefer Mishlei (31:10) describes the worth of the “woman of valor” as “far beyond that of rubies,” and in this verse the value of wisdom is described as “better than rubies.” Rabbi Menachem Mendel Schneerson, the twentieth century leader of the Chabad-Lubavitch Hasidic movement, once told former Haifa mayor Arie Gurel: “In Haifa, there is a sea. One shouldn’t become intimidated by something that is deep. This is the uniqueness of Haifa: It has a sea and there is a valley and in the valley are precious stones and gems. The Holy One, Blessed Be He, did a wondrous thing; He concealed them in the depths of the earth, and in any case, in the depth of the river.” Based on that conversation, a company called Shefa Yamim was started for the purpose of searching for precious stones near Haifa. Over the years, Shefa Yamim has discovered diamonds and other precious stones hidden in the Land of Israel, among them rubies.