In citrus fruits sometimes ripe fruits will turn orange and then turn green again (either all over or in patches), it’s called regreening. It’s usually due to either chilly night temperatures or high UV exposure, so the same tree might produce completely orange or orange and green or completely green ripe fruit all in the same year.

Kumquats are taxonomically weird and may or may not be citruses, so I’m not sure that’s what’s happening in the OP, but I would guess it probably is.

[–] AFKBRBChocolate@lemmy.world 4 points 9 months ago (1 children)

It wasn't as much the color as the shape I was commenting on. OP's looks like a ball, but I've only seen them oblong (I've heard that "quat" means something like "pear shaped").

[–] Catoblepas@lemmy.blahaj.zone 4 points 9 months ago

My bad, based on the pic I thought you meant the color!

[–] qupada@kbin.social 1 points 9 months ago (1 children)

I've never seen them in a store here in New Zealand. I've been trying to grow them, but while the tree is doing well it is yet to produce fruit.

I did manage to buy some at a supermarket in Berlin a few years ago while on holiday, they were packed like cherry tomatoes in a clear plastic punnet.

The egg-shaped fruit you've got are frequently the "Meiwa" or "Nagami" cultivars, OP's round fruit may be the "Marumi".

[–] AFKBRBChocolate@lemmy.world 1 points 9 months ago

Oh! You're exactly right. I've never heard of or seen Marumis, but googling them that's exactly what OP has.

And it looks like I was wrong about the "quat" part - it means "orange."