The gold of Ophir - Uniformly spoken of as the most precious gold; see the notes at Job 22:24.
With the precious onyx - The onyx is a semi-pellucid gem, with variously colored veins or zones. It is a variety of the chalcedony. The Arabic word denotes that which was of two colors, where the white predominated. The Greeks gave the name "onyx" ὄνυξ onux to the gem from its resemblance to the color of the thumbnail; see Passow.
Or the sapphire - See the notes at Job 28:6.

The gold of Ophir - Gold is five times mentioned in this and Job 28:17 and Job 28:19, and four of the times in different words. I shall consider them all at once.
1. סגור Segor, from סגר sagar, to shut up. Gold. in the mine, or shut up in the ore; native gold washed by the streams out of the mountains, etc.; unwrought gold.

1. שהם shoham, the Onyx, from ονυξ, a man's nail, hoof of a horse, because in color it resembles both. This stone is a species of chalcedony; and consists of alternate layers of white and brown chalcedony, under which it generally ranges. In the Vulgate it is called sardonyx, compounded of sard and onyx. Sard is also a variety of chalcedony, of a deep reddish-brown color, of which, and alternate layers of milk-white chalcedony, the sardonyx consists. A most beautiful block of this mineral sardonyx, from Iceland, now lies before me.
2. ספיר sappir, the Sapphire stone, From ספר saphar, to count, number; probably from the number of golden spots with which it is said the sapphire of the ancients abounded. Pliny says, Hist. Nat. lib. xxxvii., cap. 8: Sapphirus aureis punctis collucet: coeruleae et sapphiri, raraque cum purpura: optimae apud Medos, nusquam tame perlucidae. "The sapphire glitters with golden spots. Sapphires are sometimes of an azure, never of a purple color. Those of Media are the best, but there are none transparent." This may mean the blood stones; but see below. What we call the sapphire is a variety of the perfect corundum; it is in hardness inferior only to the diamond. It is of several colors, and from them it has obtained several names.
1. The transparent or translucent is called the white sapphire.
2. The blue is called the oriental sapphire.
3. The violet blue, the oriental amethyst.
4. The yellow, the oriental topaz.
5. The green, the oriental emerald.
6. That with pearly reflections, the opalescent sapphire.
7. When transparent, with a pale, reddish, or bluish reflection, it is called the girasol sapphire.
8. A variety which, when polished, shows a silvered star of six rays in a direction perpendicular to the axis, is called asteria.
When the meaning of the Hebrew word is collated with the description given by Pliny, it must be evident that a spotted opaque stone is meant, and consequently not what is now known by the name sapphire. I conjecture, therefore, that lapis lazuli, which is of a blue color, with golden-like spots, formed by pyrites of iron, must be intended.
The lapis lazuli is that from which the beautiful and unfading color called ultramarine is obtained.

1. שהם shoham, the Onyx, from ονυξ, a man's nail, hoof of a horse, because in color it resembles both. This stone is a species of chalcedony; and consists of alternate layers of white and brown chalcedony, under which it generally ranges. In the Vulgate it is called sardonyx, compounded of sard and onyx. Sard is also a variety of chalcedony, of a deep reddish-brown color, of which, and alternate layers of milk-white chalcedony, the sardonyx consists. A most beautiful block of this mineral sardonyx, from Iceland, now lies before me.
2. ספיר sappir, the Sapphire stone, From ספר saphar, to count, number; probably from the number of golden spots with which it is said the sapphire of the ancients abounded. Pliny says, Hist. Nat. lib. xxxvii., cap. 8: Sapphirus aureis punctis collucet: coeruleae et sapphiri, raraque cum purpura: optimae apud Medos, nusquam tame perlucidae. "The sapphire glitters with golden spots. Sapphires are sometimes of an azure, never of a purple color. Those of Media are the best, but there are none transparent." This may mean the blood stones; but see below. What we call the sapphire is a variety of the perfect corundum; it is in hardness inferior only to the diamond. It is of several colors, and from them it has obtained several names.
1. The transparent or translucent is called the white sapphire.
2. The blue is called the oriental sapphire.
3. The violet blue, the oriental amethyst.
4. The yellow, the oriental topaz.
5. The green, the oriental emerald.
6. That with pearly reflections, the opalescent sapphire.
7. When transparent, with a pale, reddish, or bluish reflection, it is called the girasol sapphire.
8. A variety which, when polished, shows a silvered star of six rays in a direction perpendicular to the axis, is called asteria.
When the meaning of the Hebrew word is collated with the description given by Pliny, it must be evident that a spotted opaque stone is meant, and consequently not what is now known by the name sapphire. I conjecture, therefore, that lapis lazuli, which is of a blue color, with golden-like spots, formed by pyrites of iron, must be intended.
The lapis lazuli is that from which the beautiful and unfading color called ultramarine is obtained.

It cannot be valued with the gold of Ophir,.... Which is often spoken of in Scripture as choice gold, if not the best; See Gill on Job 22:24; the sense is, that the gold of Ophir is not of the value of wisdom, or of the same worth with that, and so not sufficient to purchase it: with the precious onyx and sapphire: two precious stones that were in the breastplate of the high priest, of which See Gill on Exodus 28:9; see Gill on Exodus 28:18, and See Gill on Exodus 28:20; but not so precious, or of such value as wisdom. Pliny (y) speaks of the onyx stone as in Arabia, near which Job lived, and who doubtless was acquainted with it and its worth, and also with the sapphire he makes mention of before; see Gill on Job 28:6. The word for "valued" is by some rendered "strowed" (z), as goods are when they are exposed to sale; but wisdom should not be laid, or put on a level with these, though so excellent and precious.
(y) Nat. Hist. l. 37. c. 6. (z) "verbum significat sternere", Michaelis.

gold of Ophir--the most precious (See on Job 22:24 and Psalm 45:9).
onyx-- (Genesis 2:12). More valued formerly than now. The term is Greek, meaning "thumb nail," from some resemblance in color. The Arabic denotes, of two colors, white preponderating.