Exodus 39:11 (c) This green stone represents praise, worship and adoration which begins now and lasts throughout eternity. Judah which means "praise" had his name graven on the emerald stone on the breastplate of the high priest.
Revelation 4:3 (c) This complete rainbow was given this color to typify the eternal character of GOD's grace and the everlasting nature of GOD's covenant of mercy. It was "green" to signify eternal praise.