Ruby

(Heb. peninim), only in plural (Lam. 4:7). The ruby was one of
the stones in the high priest's breastplate (Ex. 28:17). A
comparison is made between the value of wisdom and rubies (Job
28:18; Prov. 3:15; 8:11). The price of a virtuous woman is said
to be "far above rubies" (Prov. 31:10). The exact meaning of the
Hebrew word is uncertain. Some render it "red coral;" others,
"pearl" or "mother-of-pearl."