Folks, above are some pictures of some Wharfedale jade 5's in Vintage Cherry wood veneer. The Rosewood is just like this, with no lacquer or gloss. Wharfedale defines the material as:
Crystalam – a laminated material formed from a series of critically specified natural wood elements and composites, formulated to reduce panel vibration and acoustic leakage to below audibility.
I believe that all speakers with curvatures, need to have several thin pieces of wood bonded together, otherwise, the curvature could not be formed.
The manuals are of no help. I think that they are written in China, but have parts that do not apply to the Jade series. Wharfedale confirmed this. Here is the deal. Wharfedale USA suggested using lemon oil. Wharfedale UK stated that the manual only recommended a dry or damp cloth, but that lemon oil should not hurt it, but that I should first try on an unconspicuous location