Create a mystical and immersive book cover background. The base is crafted from

Create a mystical and immersive book cover background. The base is crafted from dark, elegant leather, featuring delicately engraved gold details that evoke sophistication and mystery. The leather texture displays a smooth pattern with natural veins and subtle color variations, while the gold engravings form intricate arabesques that seamlessly integrate into the design. Positioned slightly off-center to the right, a multi-faceted diamond is embedded as a raised seal, adding a tactile dimension to the textured background. The overall aesthetic should blend luxury with an ethereal, magical atmosphere.