I am not an expert in stones, and therefore I am not sure of the color choices of a Sardius - Carnelian. The Red-Brown color that I found does not fit with the true rainbow order, but I found a light orange-yellow which does fit the spectrum much better. Also the Jacinth is usually an orange color, but the lighter version again fits the spectrum much more accurately. The stones I choose gives you a general idea, but in no way can it show the brillance of how awesome the foundation is! I hope this will help you to be somewhat prepared for your arrival to the New Jerusalem.
Prism photograph from hyperphysics.phy-astr.gsu.edu
https://www.crystalvaults.com/crystal-encyclopedia/crystal-guide