Using the uploaded product photo, generate a high-resolution mockup with these exact specifications: [COMPOSITION]: The product standing on a polished black onyx slab. [LIGHTING]: Gold-toned 'Golden Hour' directional light from the side, creating warm, metallic highlights on the jar. [BACKGROUND]: A solid, dark onyx-black matte background (#0A0A0A). [SHADOW]: Deep, dark reflections and a sharp contact shadow. [PRODUCT INTEGRITY]: STRICTLY PRESERVE the product's original surface. DO NOT add any new text, logos, or branding. [MOOD]: Opulent, premium, 'liquid gold' aesthetic.