properly a flower of a reddish blue or deep purple (hyacinth), and hence a precious stone of that colour ( Revelation 21:20 ). It has been supposed to designate the same stone as the ligure (Heb. leshem) mentioned in Exodus 28:19 as the first stone of the third row in the high priest's breast-plate. In Revelation 9:17 the word is simply descriptive of colour.

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.