Cross reference
Revelation 21:20
20 The fifth, sardonyx; the sixth, sardius; the seventh, chrysolite; the eighth, beryl; the ninth, topaz; the tenth, chrysoprase; the eleventh, jacinth; the twelfth, amethyst.
Revelation 4:3
3 And to my eyes he was like a jasper and a sardius stone: and there was an arch of light round the high seat, like an emerald.