Aventurine is a semi-precious gemstone with a granular structure, featuring a sparkling effect due to mineral inclusions. In Assassin's Creed Origins, it would be modeled as a small, polished stone with a smooth, glossy finish, showcasing its signature green hue with subtle golden flecks. The gem would have a slightly irregular, organic shape to reflect its natural formation, with careful attention to light reflection to emphasize its unique aventurescence.