Philosopher's Stone on a Frozen Lake, Photoreal

Photorealistic scene of the Philosopher's Stone resting on a vast frozen lake at dusk. A luminous, faceted gemstone about the size of a human fist glows with an inner emerald-green light. Its facets bear delicate alchemical runes; light refracts through the crystal and casts green halos on the ice. The lake's surface is glassy and cracked, with fine frost and intricate ice textures. Snow-dusted pines line the distant horizon while a pale aurora or dusky blue twilight fills the sky. A faint mist rises from the cold water, and the stone's glow reflects in the ice, creating shimmering caustics. The composition is cinematic with shallow depth of field focused on the stone, ultra-detailed textures, and high-dynamic-range lighting.