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Create a vertical luxury jewelry advertisement for an elegant diamond necklace called [PRODUCT NAME]. The necklace should float above a miniature city at night, as if the chain forms a glowing skyline path around tiny buildings, streets, and golden windows.

Composition: 9:16 premium campaign poster, necklace as the hero object in the upper center, miniature city below, soft black-to-champagne background, dramatic spotlight from above, and subtle reflection on a polished obsidian surface.

Jewelry detail: show precise diamond facets, platinum prongs, delicate chain links, brilliant highlights, controlled sparkle, and realistic luxury product photography texture. The necklace should feel expensive, wearable, and sharply in focus.

Miniature city: tiny art-deco buildings, glowing windows, small roads, street lamps, and elegant scale contrast. Keep the miniature city cinematic but secondary to the jewelry. Use warm golden light from the city to rim the lower edge of the necklace.

Ad direction: leave clean negative space for a headline and short product line. Use refined editorial lighting, no real brand marks, no clutter, and a polished high-conversion luxury ecommerce feel.

Style: AI jewelry advertising prompt example, miniature city product scene, luxury diamond campaign, cinematic macro photography, premium retail poster, ultra-realistic commercial lighting.