Carbuncle
This word represents two Hebrew words. The first may he a general term to denote any bright,sparkling gem, Isa 54:12 the second, Ex 28:17; 39:10; Eze 28:13 is supposed to be and smaragdus or emerald.
Bibliography Information Smith, William, Dr "Definition for 'Carbuncle' Smiths Bible Dictionary". bible-history.com - Smiths; 1901.