As you can see, Ravignat calls this “The Jewel of a Sovereign Prince of the 89th” degree of Memphis Misraim. Unfortunately he gives no source for the image. In the ritual the image is described as:
a gold four pointed star or square on which is superimposed another square in the midle of which is a point within a circle
Also see Double Square with Dot and Double Square with Circle, Dot and Moon.
Ravignat, p. 344