Elegant flat-lay product shot of a pear-cut diamond pendant on a long fine silver chain [INSERT PRODUCT REFERENCE] composed in a gentle sweeping curve across deep royal blue silk satin fabric with luminous folds and natural creases, the diamond composed in the lower third catching brilliant light, gentle overhead studio illumination with gentle highlights along the chain, hyper-lifelike high-luxury jewelry photography, minimal sophisticated mood, crisp focus throughout, high-end ad brand campaign aesthetic, 4:5 portrait image layout.