I believe what you're asking about is a melanoma. Changes in the color of the iris, and the thickening of the iris can, but don't always, mean that your kitty has developed one. It's usually found in older cats but it doesn't rule out younger ones.
On the other hand, Toby (in my sig) had two apple green eyes until he was about 3 years old. I started to see a color changes in his right eye...it looked like this dark orangy brown was leaking in. One day it was a solid mark like your kitty's and the next week his whole eye would be speckled. It took about a full year for it to competely turn dark orange. I have a trusted friend that's a vet and I had her look at it. Turns out that he's fine...so he's a case of the "don't always". Please don't worry yourself until you've had it looked at but I'd almost bet that you're kitty is just gonna have gorgeous eyes!
She also told me that if you can see the same color in the other eye, little specks or shades of it, then it's most likely not a melanoma. Toby has them, little teeny specks of the same orangy color. If you just see specks in one eye, you should probably get it checked as soon as possible. Don't worry about the vet, that have lots of practice dealing with cats...Dixie is part barbwire, alligator and gazelle, lol, but when they handle her they do it with ease...we tend to not hold on as tight and baby them.
Came back to share a pic... This was him right before his eye changed. They both look yellow but they were bright bright clear green.
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