With issues like this it's hard to pin down a specific cause. It may be environmental (does it ever change during the year?) or have to do with the way the plant is fertilized/watered/lit, etc. I've seen identical hybrids grown by 2 different growers that look like completely different hybrids, so cultural conditions can play a huge role.

I'm not really an expert (so I may be totally wrong), but I've read that AVs are extremely susceptible to mutations. So maybe it mutates over time? It could have to do with it's genetics too.

Or maybe, that breed just changes color as it ages, or with the seasons (like a tree)! I don't know though. All I can say is the plant looks fine to me, you're doing a great job :)

Is this what they call "birthmarking?" Or is birthmarking just patchy color change? Rosie

Here's a good description of birthmarking that I got from an AVAVS article. (I've included the link to the entire article below it if you want to read more. It's all about variegated foliage.)

Birthmarks
This isn’t a form of variegation in foliage
but simply a birthmark. It’s a genetic
condition that can be found on the
underside of leaves. An easy example is
to notice that the underside of silver
under sided leaf exhibits red staining or
markings. This is often found in multicolored
blooming varieties. By nature it
states genetically instability, hybridizers
usually set these plants apart for future
hybridizations programs. It usually
makes the prettiest plant (but may not
always bloom or grow to specifications)
as more color in the leaves usually
means more color in the blooms also.

http://www.avavs.com/varifs.pdf

I think what we can gather from this is that Laura's Little Kunzite is exhibiting genetic instability. Now, I've not grown this variety and I don't know it this is common in this plant, but AV's do some very wonderful and interesting things when they make these changes (sporting.) Of course, it can also be very annoying if you liked the variety the way it was and wanted it to stay that way, LOL. But I'd keep an eye on this one and see what it decides to become. It is very interesting!

This doesn't apply to the foliage, but I have one that can bloom in 3 different colors all at once. I have a mini that shocked me when, all at the same time has 3 different colored blooms: solid white, light pink/white variegated and deep pinkish purple/white variegated. I know the variegated ones can bloom in a variety of different patterns of the variegation colors, but the maroon has me baffled and amazed.

I don't know the name of this variety since it was labeled with just the generic "African Violet" tag where I had bought it at a bigger name store where the people are lucky just to even know it's an African Violet period. Why do they never put an employee in the plant department of the store that knows something about plants? :-/ They seem to all throw the plants out in full sun, whether the plants, like it or not, and then under water them. ):-< Herbicidal maniacs......

Thanks Anne! Rosie