No doubt, this is not Garcinia madruno. I have two big native trees of Garcinia madruno in Colombia. Harvest time is about July.
In humid climate a big problem is infestationwith insects.
Today in Colombia this specie do not have any commercial value in the fruit market, as mangosteen is quite easier in cultivation
and higher production. Sorry, but it is a specie in decline.
Regards
Manfred Harrer