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In Revelation Chapter four, verse three, the verse says: “And He who was sitting was like a jasper stone and a sardius in appearance; and there was a rainbow around the throne, like an emerald in appearance.”
“He who was sitting” is either the Father or the Son, being strong as stone, and, like Landscape Jasper, has a great many designs. Sardius is the same thing as Carnelian, which has a deep orange color, through which we can see a portion, and then the stone is too deep to see any further, just like God.
The rainbow around the throne is not like an Emerald in the sense that the rainbow is green all through, it means that each color is beautiful and vitreous like an Emerald.
- Carnelian Was a Favorite With the Ancient Peoples (nancyhelmerdesigns.com)