Create a large oblong fantasy bed sculpted from stone, with raw-cut semiprecious stones (amethyst, quartz, jade) and natural veins of metal (bronze, gold, silver) running through the frame. The plush mattress is richly dressed in layered satin and velvet bedding. Design should feel opulent, arcane, and suited to a fantasy setting. Render in realistic detail. Suggest mesh layers: 1) Stone bed frame, 2) Metal veins, 3) Gemstone accents, 4) Mattress, 5) Bedding (sheets, blankets, pillows).