Of foreign derivation; a gem, probably the topaz -- topaz.
Englishman's Concordance
1) topaz or chrysolite 1a) a precious stone Part of Speech: noun feminine A Related Word by BDB/Strong’s Number: of foreign derivation Same Word by TWOT Number: 1762
Brown-Driver-Briggs
מִּטְדָהnoun feminine (masculine according to AlbrZAW xvi (1896), 108) topaz or chrysolite (according to ᵐ5τοπάζιον, ᵑ9topazius, etc.; probably foreign word, compare Sanskrit pîta (properly yellow)); — named with other precious stones Ezekiel 28:13; Exodus 28:17=Exodus 39:10; construct מִּטְדַתכּֿוּשׁJob 28:19. — See PlinNH xxxvii. 8 -32, Houghton in SmDB, Topaz RiHWB, Edelstein.
Exodus 28:17 HEB:ט֗וּר אֹ֤דֶם פִּטְדָה֙ וּבָרֶ֔קֶת הַטּ֖וּר NAS: of ruby, topaz and emerald; KJV: [shall be] a sardius, a topaz, and a carbuncle: INT: row of ruby topaz and emerald a row
Exodus 39:10 HEB:ט֗וּר אֹ֤דֶם פִּטְדָה֙ וּבָרֶ֔קֶת הַטּ֖וּר NAS: of ruby, topaz, and emerald; KJV: [was] a sardius, a topaz, and a carbuncle: INT: row of ruby topaz and emerald a row
Job 28:19 HEB:לֹֽא־ יַ֭עַרְכֶנָּה פִּטְדַת־ כּ֑וּשׁ בְּכֶ֥תֶם NAS:The topaz of Ethiopia cannot KJV:The topaz of Ethiopia shall not equal INT: cannot equal the topaz of Ethiopia gold
Ezekiel 28:13 HEB:מְסֻכָתֶ֙ךָ֙ אֹ֣דֶם פִּטְדָ֞ה וְיָהֲלֹ֗ם תַּרְשִׁ֥ישׁ NAS: The ruby, the topaz and the diamond; KJV: the sardius, topaz, and the diamond, INT: was your covering the ruby the topaz and the diamond the beryl