Emerald-cut diamond of individuality

The emerald-cut is a rectangular or square shape with cut corners, and it's known for its step-like facets. This cut was indeed popularized during the art deco period, known for its geometric shapes and symmetrical designs.

The emerald-cut diamond highlighting clarity and revealing any flaws is correct. This cut emphasizes the clarity of the stone and its geometric precision. The symbolism you ascribe to the diamond, including confidence, efficiency, an open heart, and personal clarity, is a creative and poetic interpretation. While diamonds, in general, are often associated with purity and strength, the specific symbolism can vary based on cultural, historical, or personal perspectives.