The effect is created by combining several operations:

1. Blend Operations: These combine textures to form symmetrical shapes like squares or diamonds.

2. Mathematical Nodes: Subtract, Step, and One Minus nodes are used to define sharp edges and transitions, creating a clean shape with a glowing center and dark edges.Edge

3. Highlight: EdgeWidth and EdgeColor add a glowing highlight to the edges of the shape, enhancing the visual contrast.

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The final result is a glowing diamond or star shape with sharp, defined edges and a bright center.