For his “45th Degree: Chevalier du Soleil – Knight of the Sun”, Ravignat presents the same image as above. He says it is a “Jewel of the Knights of the Sun from the Ancient and Accepted Scottish Rite”. I found the same image on the website of Brick Masons and they say that it is a 28th degree Memphis-Misraim jewel. “Chevalier du Soleil” is indeed the 28th degree of Memphis-Misraim (Ravignat uses a different counting in his reconstructed Traditional Egyptian Freemasonry).
In Ravignat’s translation of the ritual we find the following passage:
Newly made Knight and Sage, it is my pleasure to invest you with the collar of this degree. It shows a Sun, the Glory of God, within a triangle and forming a double square.
Here is not not as much an officier jewel, but a badge of the degree.
Brick Masons