As you can see, Ravignat calls this “The Jewel of a Sovereign Prince of the 90th 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 double square in the middle of which is a point with a circle. This star is flanked by a crescent Moon.
Also see Moon and Square, Double Square and Dot, Double Square, Circle and Dot.
Ravignat, p. 363