some gem of a deep blue color

; hyacinth in cl., a flower, prob. the dark blue iris; in late writers, a precious stone of the same colour, perhaps the sapphire: (Phil., FlJ, al.).† Re 21:20

hyacinth

jacinth, a precious stone of the color of hyacinth.

hyacinth

the "hyacinth" or "jacinth", i.e. some gem of a deep blue color, probably the zirkon

jacinth

ὑακίνθος, -ου, ό [in LXX chiefly for תְּכֵלֶת ;] hyacinth; (a) in cl., a flower, prob. the dark blue iris; (b) in late writers, a precious stone of the same colour, perhaps the sapphire: Rev.21:20 (Phil., FlJ, al.).† (AS)