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.