Crystal/Diamond Skin Effect

Transform the person's skin in this photo to appear as if it's made of transparent, faceted crystal or diamond material. Their face and visible skin should have geometric crystal facets catching and refracting light in rainbow prismatic patterns. The crystal skin should be translucent in places, revealing subtle light passing through. Each facet should reflect the environment slightly differently, creating a kaleidoscopic effect across the skin surface. Their eyes should remain human and warm, creating a striking contrast with the crystalline skin. Add caustic light patterns cast by the crystal skin onto nearby surfaces. Hair should remain natural, creating another beautiful contrast. The background should be simple and dark to maximize the crystal light effects.