Boyd’s Bible Dictionary:
Used by Hebrews for beads and ornaments. Ranked among precious stones (Job 28:18; Ezek. 27:16).
Concise Bible Dictionary:
Red Coral
The Hebrew word is rarnoth, and occurs only in Job 28:18 and Ezekiel 27:16: it signifies high priced or costly things. The Rabbis think it refers to red coral.
Strong’s Dictionary of Hebrew Words:
Meaning:
from 7213; something high in value, i.e. perhaps coral
Jackson’s Dictionary of Scripture Proper Names:
heights