I took some pictures of some lovely jewelry my lovely wife made, yesterday. And when I went back today to look at the results, I noticed something odd. There was an unexpected dark halo around the subjects.

I thought hmm... is my fancy macro lens prone to some strange halo distortion when shooting bright subjects against medium-blue backgrounds ? I sure hope not - that's not a cheap piece of glass. So, I did some research about lenses and dark halos on the web, but didn't find anything that sounded like the problem I was seeing. Stumped, I did the next best thing to Googling: a scientific experiment! I put a different lens on the camera and tried the same shot. Result? Exact same problem. So it probably wasn't the macro lens (whew). It was likely the camera.
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And fruits that are commonly known as vegetables, too!