The word ὑάκινθος signifies hyacinth, and this, as a colour, is a deep purple. In Revelation 9:17 the horsemen had breastplates of fire, jacinth, and brimstone, which seem to imply flashes of coloured light. In Revelation 21:20 the jacinth garnishes the eleventh foundation of the heavenly Jerusalem. It is supposed by some to be the same as the ligure. The Greek word occurs in the LXX in Exodus 25:4; Exodus 26:1 , etc., but is translated 'blue.'