+ carbuncle, + mason, + plummet, (chalk-, hail-, head-, sling-)stone(-ny), (divers) weight(-s)

Boyd’s Bible Dictionary:

(little coal). A gem of deep red color (Isa. 54:12). A stone in the high-priest’s breastplate (Ex. 28:17; 39:10).

Concise Bible Dictionary:

Two Hebrew words are so translated.
1. eqdach, a stone of a fiery sparkling nature (Isa. 54:12).
2. bareqeth, a stone of a glittering brightness (Ex. 28:17; Ex. 39:10; Ezek. 28:13).
 
Cabochon Carbuncle Garnet

Strong’s Dictionary of Hebrew Words:

Number:
68 (find all occurrences in KJV Bible)
Transliteration:
’eben
Phonic:
eh’-ben
Meaning:
from the root of 1129 through the meaning to build; a stone
KJV Usage:
+ carbuncle, + mason, + plummet, (chalk-, hail-, head-, sling-)stone(-ny), (divers) weight(-s)