The premium quality has a more homogeneous appearance than the natural quality. The peculiarities of the wood and the natural variations in colour are limited. The natural quality is, on the contrary, more heterogeneous, and we left more natural peculiarities of the wood while selecting the lamellas, such as sapwood, knots or lamellas of different colours, although of the same species.
It is also a budgetary and aesthetic choice that must be made between these two aspects.