Jacinth

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