Job 28:18

“No mention shall be made of coral, or of pearls, etc.] Coral is a marine plant, is as hard as a stone, and of such value as to be reckoned among precious stones; (see Gill on “<262716>Ezekiel 27:16”). In Arabia Felix, on the shore of the Red sea, is a place called Coralia f995; it may be from coral found there. Pearls are from shellfish taken out of the sea, though these seem rather intended in the next clause: the words “ramoth” and “gabish” are left untranslated by some, and by others are taken for precious stones, though unknown, so called because they are found in high places, which both words signify. The Targum renders the first by “sandalchin”, and seems to be the same with the…”

“Red coral (Eze 27:16). pearls--literally, "what is frozen." Probably crystal; and Job 28:17 will then be glass. rubies--UMBREIT translates "pearls" (see Lam 4:1; Pro 3:15). The Urim and Thummim, the means of consulting God by the twelve stones on the high priest's breastplate, "the stones of the sanctuary" (Lam 4:1), have their counterpart in this chapter; the precious stones symbolizing the "light" and "perfection" of the divine wisdom.”

“No mention shall be made of coral - That is, as a price by which to purchase wisdom, or in comparison with wisdom. The margin here is, “Ramoth” - retaining the Hebrew word ראמה râ'mâh. Jerome renders it, “excelsa” - exalted or valuable things. So the Septuagint, Μετέωρα Meteōra - exalted or sublime things; as if the word were from רום, to be exalted. According to the rabbis, the word here means “red coral.” It occurs also in Ezekiel 27:16, where it is mentioned as a valuable commodity in merchandise in which Syria traded with Tyre, and occurs in connection with emeralds, purple, broidered work, fine linen, and agate. The coral is a well known marine substance, not valued now as if it…”

“coral: or, Ramoth, Eze 27:16 pearls: Mat 7:6, Mat 13:45, Mat 13:46; Ti1 2:9; Rev 17:4, Rev 18:12, Rev 21:21 rubies: Pro 3:15, Pro 31:10; Lam 4:7 Job 28:19”