[τοπάζιον] neuter of a presumed derivative (alternately) of τόπαζος (a "topaz"; of uncertain origin); a gem, probably the chrysolite
Usages throughout the bible
Revelation 21:20
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The fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, a topaz; G5116 the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.