Abbott-Smith Manual Greek Lexicon
ἴασπις (G2393)
4 ἴασπις , -ιδος, ἡ , [in LXX: Ex 28:18 36:18 ( 39:11 ) ( יַהֲלֹם ), Is 54:12 ( כַּדְכֹּד ), Ez 28:13 ( יָשְׁפֵה , v. BDB, Lex. , s.v.)*;] jasper , apparently not the modern stone of that name, but a translucent stone ( DB , s.v.): Re 4:3 21:11 , 18 , 19 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain