Charles Ellicott Commentary Lamentations 4:7

"Her nobles were purer than snow, they were whiter than milk; They were more ruddy in body than rubies, their polishing was as of sapphire." — Lamentations 4:7 (ASV)

Her Nazarites ... —The word has been rendered “princes” by some commentators, on the ground that it means literally those who are “separated” from their brothers (Genesis 49:26; Deuteronomy 33:16), whether by rank or by the vows of consecration. There is no reason, however, for abandoning the rendering of the Authorised Version. The reference to the Nazarites in Amos 2:11-12 shows that they were prominent as a body during the history of the monarchy, and the drift of Jeremiah’s mind, as seen in his admiration of the Rechabites (Jeremiah 35), shows that he was likely to think of them with reverence.

The temperance, purity, cleanliness of such a body seem to have made them conspicuous among their peers for an almost angelic beauty. (Compare the interesting parallel of Daniel 1:15.) They had the red and white complexion which was in the East the ideal of comeliness (1 Samuel 17:42; Song of Solomon 5:10). Their “polishing” (better, their form) was faultless, like that of a well cut sapphire. For “rubies” read coral.