Simira spp., including Simira salvadorensis (syn. Sickingia salvadorensis), of the family Rubiaceae, the madder family
From Central America
My thanks to Paul van Rijckevorsel for this summary
Although this is NOT the same wood as "redheart", it is very similar in appearance and there seems to be a wide belief that it IS the same wood, and the pics below, although advertised as chakte kok, may be redheart (Cosmocalyx spectabilis, also of the family Rubiaceae).
web pics
planks
planks from the BogusColorVendor, so the bright red is likely overdone by quite a bit.