Blue and purple
In Ezekiel 27:7, this signifies rituals corresponding to internal worship, and so represent celestial things. (Arcana Coelestia 1156)
In Jeremiah 10:9, this signifies being clothed with natural things that are seemingly in agreement. (Arcana Coelestia 424)
Covering
A covering of precious stones (Ezekiel 28:4, 13) signifies the truths of intelligence.
(Odkazy: Apocalypse Revealed 90)