I recall Mike T from Aus posting about other color forms (gold, pink, pearl) that they have there that are supposed to be superior to the purples & green. He & Oscar also talked about a cousin, C. argentium var. auratum, that is supposed to also be a cut above the common caimito. I haven't tried the auratums yet but have trees in the ground from Oscar & Mike (still a few years to go).
There are many species of chrysophyllum, and i believe they are all edible. The pink is the same as the Chrysophyllum argenteum var. auratum. The pink starapple tree made a lot of fruits this year, over 200. They are sweeter than regular starapple, have longer season, only one seed per fruit, but fruit is a bit smaller than regular starapple.
I mailed seeds to many people, including forum members, a couple weeks ago. Sorry but no more seeds for a couple of months. There is a new crop already on the tree, but fruits are still small.
Oscar, are there more cold tolerant species besides Chrysophyllum cainito? What about auratum?
I concur 100% with Oscar, Mike and John: top-tier fruit for sure.
Oscar: I also have pink cultivars and agree that they're better but smaller. Can you clarify? you're saying pink cultivar is same species as Chrysophyllum argenteum var. auratum?
Two other benefits of this fruit IMO: 1. Can stay on the tree longer when ripe (i.e. doesn't fall to ground or gets overripe easily) and 2. Doesn't get fruit flies in my experience.