Probably the best pic so far getting close to how it looks in real life. It's crazy difficult to photograph, and after some reading I think it's due to the large aperture lenses I favor. If you're interested, I think this has to do with the fact that our pupils are small and therefore only see one of the colors being refracted, but the large lens sees them all and then refocuses them down to white pinpoints. If you notice in the pic above, the top is slightly out of focus (OOF) due to shooting at f/4 and that's where you can see the rainbow colors. If I throw the entire thing OOF then you see the colors I see with my eyes that I'm trying to capture:
Those colors are what I see, but the camera does not record them when in focus. Thinking more about the big lens theory, I whipped out my iPhone, but that was a failure, too though I don't have enough real manual control with that. I do have a Fuji camera with a smallish lens that I may try. I also need to try some polarizing filter experiments.
