Probably of foreign derivation (compare Tarshiysh); a gem, perhaps the topaz -- beryl.
see HEBREW Tarshiysh
H8658. tarshish
I. תַּרְשִׁישׁ noun masculine a precious stone, perhaps yellow jasper, or other gold-coloured stone (ᵐ5L Exodus 28:20; 39:13 χρυσόλιθοχ, so JosAnt. iii. 7, 5 [168], see PetrieHast. DB STONES, PRECIOUS MyresEncy. Bib. ID. § 17 DrDaniel 10:6); — ת ׳כְּעֵין Ezekiel 1:6; ת אֵבֶן ׳כְּעֵין 10:9; in list of gems 28:13; Exodus 28:20; 39:13; in simile of resplendent body Daniel 10:6, compare Song of Solomon 5:14.