Strong’s Greek
G5116 — topazion
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
τοπάζιον
topazion — pronounced top-ad'-zee-on
neuter of a presumed derivative (alternately) of topazos (a "topaz"; of uncertain origin); a gem, probably the chrysolite:--topaz.
1 occurrence in the KJV.
Revelation 21:20
The fifth, sardonyx; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.