Charles Ellicott Commentary Isaiah 62:3

"Thou shalt also be a crown of beauty in the hand of Jehovah, and a royal diadem in the hand of thy God." — Isaiah 62:3 (ASV)

A crown of glory ... —The “crown” as distinctively kingly; the “diadem” implies a “tiara,” like the mitre of the High Priest (Exodus 28:4; Zechariah 3:5).

The two “hands” are expressed by different words in the Hebrew, the second having the sense of the open palm of the hand.

The “new crown,” i.e., the new glory accruing to Jehovah from the restoration of Jerusalem, is not worn on the head (thought of, we may believe, as already crowned from eternity), but held forth in the hand for the gaze of the adoring nations.