Matthew Henry on 2 Samuel 12:26–end
We have here an account of the conquest of Rabbah, and other cities of the Ammonites. Though this comes in here after the birth of David's child, yet it is most probable that it was effected a good while before, and soon after the death of Uriah, perhaps during the days of Bath-sheba's mourning for him. Observe, 1. That God was very gracious in giving David this great success against his enemies, notwithstanding the sin he had been guilty of just at that time when he was engaged in this war, and the wicked use he had made of the sword of the children of Ammon in the murder of Uriah. Justly might he have made that sword, thenceforward, a plague to David and his kingdom; yet he breaks it, and…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Samuel 12:30
he took their king's crown from off his head--While the treasures of the city were given as plunder to his soldiers, David reserved to himself the crown, which was of rarest value. Its great weight makes it probable that it was like many ancient crowns, not worn, but suspended over the head, or fixed on a canopy on the top of the throne.
the precious stones--Hebrew, "stone"; was a round ball composed of pearls and other jewels, which was in the crown, and probably taken out of it to be inserted in David's own crown.
Adam Clarke on 2 Samuel 12:30
The weight whereof was a talent of gold - If this talent was only seven pounds, as Whiston says, David might have carried it on his head with little difficulty; but this weight, according to common computation, would amount to more than one hundred pounds!
If, however, משקלה mishkalah be taken for the value, not the weight then all is plain as the worth of the crown will be about 5075 15s. 7d. sterling. Now this seems to be the true sense, because of the added words with the precious stones; i.e., the gold of the crown, and the jewels with which it was adorned, were equal in value to a talent of gold.
John Gill on 2 Samuel 12:30
And he took their king's crown from off his head,.... The crown of Hanun the king of the Ammonites, who now fell into his hands, and whom he stripped of his ensigns of royalty, who had so shamefully abused his ambassadors, 2 Samuel 10:4,
(the weight whereof was a talent of gold with the precious stones): or, "and a precious stone"; there might be more, as our version suggests, but there was one in it remarkably large and valuable; Josephus (b) says it had in it a very precious stone, a sardonyx; and this, according to the Talmud (c) was of the value of a talent of gold. A talent was equal to three thousand shekels, as appears from Exodus 38:25; and was in value, according to Brerewood (d) o…