I think you pay a 20% premium for Rosewood. There is another 20% premium for a piano finish if you select that. Having bought Rosewood before and "attempted" my hand at piano finishing, I'm surprised they only charge a 20%.

For example, I just bought a 4' X 8' sheet of straight grain 20 mil cherry veneer for $65. The rosewood, in a lower grade than the cherry was $250. Those are my contractor rates with my supplier too.

A piano finish takes weeks to do properly. You finish sand with 600 grit then buff with a polishing pad. Apply stain, buff again, then coat with clear. Buff again, coat. Do this no less than 10 times, with at least 12 hours of dry time in between coats.

Probably more info than anyone wants, but now you have one more data point for formulating opinions......