exploring the beauty of an alexandrite stone resting on luxurious black velvet fabric. header banner mockup with copy

alexandrite banner gemstone header black copy velvet space crystal mockup luxury template jewelry vibrant colors facets gleaming high detail photorealistic cinematic low key elegant shine sparkle beauty rich hues arrangement textiles precious stone design artistry reflective surface opulence colorful illumination deep tones gem cut antique upscale decorative display ai generated