נֹפֶךְ (nōpek) is
a Hebrew noun
meaning ruby. It appears
4 times
in 2 books of the Hebrew Bible
(Strong's H5306).
Also rendered
emerald
Same Hebrew root (TWOT 1391)
Root family 1391: נֹפֶךnōpek — a precious stone in priest’s breastplate (Ex 22:18) and in Tyre’s merchandise (Ezk 27:16). RSV “emerald,” niv “turquois.”