Cross reference
Revelation 21:20
20 the fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, topaz; the tenth, chrysoprasus; the eleventh, jacinth; and the twelfth, amethyst.
Revelation 4:3
3 that looked like a jasper stone and a sardius. There was a rainbow around the throne, like an emerald to look at.