Macro close up of antique cushion cut diamond jewelry

A macro photograph of a large, antique, cushion-cut diamond, exhibiting remarkable clarity with minor inclusions and surface dust. The diamond is set in dark metal prongs, appearing to be part of a ring or pendant. Subtle rainbow refractions and spectral flares are visible within the facets due to light dispersion, with dominant blues, greens, and hints of yellow. The background is a smooth, dark, neutral gradient, providing high contrast and emphasizing the diamond's brilliance. The lighting is dramatic and directional, creating sharp highlights and deep shadows across the gem's surface. The focus is sharp on the central facets, with a shallow depth of field blurring the edges and background. The overall mood is opulent, luxurious, and somewhat mysterious, highlighting the intrinsic beauty and preciousness of the gemstone. High detail, photorealistic, professional product photography.