Close-up of a human hand firmly holding a luxurious 24K gold bullion bar, ultra-realistic gold texture, polished mirror-like surface with detailed engravings and serial number, premium wealth and luxury concept, dark black background, dramatic cinematic lighting, strong contrast, elegant reflections on the gold, professional commercial photography, high-end jewelry advertising style, shallow depth of field, sharp focus on the gold bar, photorealistic, hyper-detailed, 8K resolution, masterpiece, luxury branding aesthetic