Simply by meaning, crown is a reward of victory and diadem is headband of royalty, but both display the power and majesty of a King. They proclaim that the one wearing the crown is victorious and also worthy of all honor and praise.
Oh, what a privileged are the redeemed of the Lord, that they are a crown of glory and a royal diadem in the hand of the Lord. It is the determination of the Lord, that the Church should be glorified and adorned by HIS Salvation and righteousness. He delights in us and calls us precious.
May our lives display the glory and honor to our Lord Jesus Christ, and speak with the authority that He has given to us about the crucified Christ and the risen Savior who is seated on the right hand of God, who reigns forever and ever.