The word "beloved" in the Bible typically refers to the brothers and sisters in Christ; saved individuals. If you want to be part of God's beloved you first must be saved by the blood of Jesus Christ!
In Jude we see the blessing of the beloved:
1) The Beloved earnestly contend for the faith. (v3)
2) The Beloved keep God's word. (v17)
3) The Beloved build up their faith. (v20)
Are you part of the beloved though salvation?
Do you earnestly contend for the faith?
Do you keep God's word?
Do you build up your faith?