Faux rosewood grain over mahogany or teak veneer?  

another photo

The technique is called graining or faux bois which has its roots during the Renaissance period when trompe o oeil painting started.  It became an artistic skill that was used extensively in the 19th century Victorian era to cater the emerging middle class that wants the look of exotic woods without the high expense.  It was also very common in the early part of the 20th century on mass produced houses interior trims where a common Douglas Fir was made to look like rosewood or mahogany.  The technique requires a very good eye & painting skills using fine brushes, feathers & other sort of tools like a comb to achieve a very realistic wood grain.

Without seeing the actual furniture you got, I don't know the reasons why would someone faux paint rosewood over an exotic & expensive wood like teak or mahogany.

The previous image shows how to achieve a faux walnut & the images below shows faux mahogany & faux oak graining.

Thank you so much @minimoma😀

I will post more photos of this desk soon.😁👍

The technique requires a very good eye & painting skills using fine brushes, feathers & other sort of tools like a comb to achieve a very realistic wood grain.