Capture the sheer opulence and brilliance of a massive, flawless diamond, sparkling with an otherworldly radiance. The diamond, immense in size, casts prismatic reflections of light in a dazzling array of colors, illuminating its surroundings with an ethereal glow. Its facets are perfectly cut and polished to a mirror-like finish, creating a mesmerizing play of light and shadow. The diamond sits atop a plush, velvet cushion, enhancing its regal and majestic presence. The rich, deep hues of the velvet provide a striking contrast to the diamond's fiery brilliance, emphasizing its unparalleled beauty and value.