Cocobolo (Dalbergia retusa) grows in the Pacific regions of Central America. Cocobolo is hard, dense, oily, allergenic (causes rashes on some luthiers), resistant to bending, and vibrantly beautiful! It is certainly the boldest rosewood available. Cocobolo's colors range from bright orange through the reds to more sedate browns, usually with numerous dark brown/purple/black stripes of varying widths. Pungent and brilliant when first cut, it eventually mellows to deep red-orange with black striping.
I have made numerous lathe-turned objects with Cocobolo (it makes the best tool handles), and I have some beautiful back/side sets, but I have neither built nor played a Cocobolo guitar. I would expect one to sound brighter than guitars made with other rosewoods.