Sefer Yetzira, ascribed to the Patriarch Abraham, is a basic treatise for Jewish Mystical Meditation. Several of its chapters deal with the unique qualities of each of the 12 Jewish months and their association with a specific Tribe, Constellation, Attribute and Hebrew Letter.
The Tribe (and gemstone) for Tammuz is Reuvan.
The precious stone for Reuvan in the Breastplate of the High Priest is called the אדם (pronounced Oh-dem), a red stone which most commentators agree is a ruby, and the basis for the above painting’s colors.
The name אדם is also the word, Adam, or man, and suggests also the dudaim, the human-like mandrakes, which Reuvan gave to his mother Leah. The ruby and the mandrakes have been credited with having the power to aid fertility. This implies in the spiritual dimension
the ability to make `chidushim’ new creative discoveries – and is also connected with the first three letters of Reuvan’s name ראו,
which means seeing, even otherworldly vision. (Genesis 30:14) Reuben went…and found mandrakes in the field
וילך ראובן…וימצא דודאים בשדה
Sight – and its rectification – is the special attribute or quality of Tammuz and relates remarkably with the two aspects of the Hebrew Letter ח Chet which permeates this month. The Letter is pronounced “chet” implying Sin חטא, but it is written out חית, which can be read “chayut” positive energy or life-force.
The Letter CHET represents the marriage aמd union of the different Masculine and Feminine Energies, represented by the letter VAV ו on the right and the letter Zion ז on the left. They are connected by a “bridge”, ma’avarta, which in a holy marriage, is symbolized by the chupa חופה, the encompassing spiritual light.
The ability to connect and integrate energies implied in the letter Chet contrasts with the secular representation of the Constellation for the month – Cancer (The Crab or Crayfish) – where each force spins in its own orbit.