Alioops: nah, not a persimon... I'm familiar with them... but thanks for trying!

Falguni: Hmmmm.... now that name rings a bell.... I might have to Google. Thanks!!!

The skin stays green right through it's life cycle... kinda has a greyish patina which rubs off once you handle it.

ETA: Kamarine: not a custard apple... i know about them, they are yum