Replace “emerald-green glowing energy core” with “large, intensely luminous emerald-green energy core occupying the central shaft and branching into each tip,” and replace “soft studio lighting” with “soft studio lighting plus strong internal green illumination.” This makes the color read as a primary structural feature rather than a small accent inside the crystal.

Replace “pure white background” with “deep charcoal-black seamless background,” and change “soft studio lighting” to “dramatic rim lighting with sharp cool highlights and controlled shadows.” Keep “premium high-contrast reflections” to preserve the crystal’s polished edges against the darker field.

Keep “transparent crystal lightning bolt icon,” “futuristic faceted design,” “isolated floating single object,” and “centered composition” unchanged, then swap “emerald-green glowing energy core” for variants such as “electric-blue glowing energy core,” “violet plasma energy core,” or “amber-gold energy core.” Add “identical camera angle, scale, lighting, and white background” to each prompt so the color changes remain consistent across the series.