| Exodus 
                          28:17-20: Set it with four rows of mounted stones.
                          
                           The first of these 
                          rows shall contain a ruby, an emerald and a crystal. 
                          The second row: carbuncle, sapphire, pearl. 
                           
                          The third row: 
                          topaz, turquoise, calf eye. The fourth row: 
                          chrysolite, onyx, jasper. These stones shall be in 
                          their fullness, placed in gold settings. 
                          The ephod had two 
                          stones on its shoulder straps, both of onyx (shoham), 
                          with the names of six tribes inscribed on each stone 
                          (Ex. 29:9-12;39:6-7).  
                          As for the twelve 
                          stones in the choshen (Ex. 28:17-21;39:10-14), the 
                          Torah doesn't indicate how they correspond to the 
                          twelve tribes; but the correspondence can be found in 
                          the commentary of Rabbenu Bachya: 
                          Reuven - odem (ruby)
                           
                          Shimon - pitdah (smaragd)  
                          Levi - barekes (carbuncle)  
                          Yehudah - nofech (emerald)  
                          Yissachar - sapir (sapphire)  
                          Zevulun - yahalom (pearl)  
                          Dan - leshem (topaz)  
                          Naftali - shevo (turquoise)  
                          Gad - achlamah (crystal)  
                          Asher - tarshish (chrysolite)  
                          Yosef - shoham (onyx)  
                          Binyamin - yashfeh (jasper) 
                          The above 
                          translations of the gem names are from Ginsberg, 
                          Legends of the Jews, Vol.III pp.169-172.  
                          See also the article 
                          "Avnei Choshen ve-Ephod" in the Talmudic Encyclopedia.
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