Verse 19. The topaz of Ethiopia ] The country called Cush, which we call Ethiopia, is supposed to be that which extends from the eastern coast of the RedSea, and stretches towards Lower Egypt. Diodourus Siculus says that the topaz was found in great abundance, as his description intimates, in an island in the RedSea called Ophiodes, or the isle of serpents, Hist. lib. iii., p. 121. His account is curious, but I greatly doubt its correctness; it seems too much in the form of a legend: yet the reader may consult the place. See also Clarke on "ver. 16".
Verses 12-19 - Job here speaks of wisdom and understanding, the knowing and enjoyin of God and ourselves. Its worth is infinitely more than all the riche in this world. It is a gift of the Holy Ghost which cannot be bough with money. Let that which is most precious in God's account, be so i ours. Job asks after it as one that truly desired to find it, an despaired of finding it any where but in God; any way but by Divin revelation. (Job 28:20-28)