Current heritage-inspired jewelry design predominantly focuses on superficial morphological simulation, thereby neglecting the expressive potential of material semantics. Addressing this gap, this study applies the Cultural Product Design (CPD) framework in conjunction with visual semiotics to propose a novel material scenario for the 11th century Ly Dynasty lotus motif. Methodologically, the research integrates three-dimensional computer-aided design and manufacturing (3D CAD/CAM) technology with a modular assembly approach to functionally combine two distinct precious metals: a light-absorbing homogenous Black Gold alloy and a highly reflective Traditional Yellow Gold. Structural components were engineered with a mechanical locking tolerance of ±0.02 mm to facilitate lost-wax micro-casting. The principal findings indicate that the stark optical contrast (chiaroscuro) between the Black Gold base and the Traditional Yellow Gold relief petals successfully materializes the Zen Buddhist dualistic philosophy regarding the symbiotic relationship between ignorance and enlightenment. Furthermore, ergonomic optimizations, specifically allocating Black Gold to recessed areas and applying a safety fillet radius (R ≥ 0.4 mm) are theoretically projected to mitigate friction-based mechanical wear while reducing metal weight by 40%–50%. Ultimately, the deliberate manipulation of metallurgical properties elevates jewelry from a decorative accessory to a narrative agent, aiming to foster emotional durability and proposing a conceptual design strategy that could position the product as a contemporary heirloom.