A photorealistic close-up of a rectangular green emerald, showcasing its sharp, precise facets and rich, vibrant color. The emerald appears polished and pristine, with a slight, delicate glow that highlights its edges and adds a subtle brilliance to its surface. The lighting is soft and minimal, creating a refined, understated shimmer that enhances the gem's natural elegance without overpowering its detail. The background is neutral and unobtrusive, ensuring full focus on the rectangular emerald's captivating beauty.