What's going on with my guineas' coloring?

[brandywine]

In July, I bought eight guinea keats: four lavenders and four that were supposed to be pearls.

The lavenders and one of the pearls were about ten days younger than the three bigger "pearls." They are all about 3-3 1/2 months old now.

Well, the lavenders are that nice light gray color.

The younger of the four pearls has a brown ground color with pearl markings.

And the three older "pearls" are a sort of hodge-podge of solid-ish charcoal feathers, barred feathers, and pearl-marked feathers.

What's going on? What color guineas do I really have?

Photo taken yesterday:

 

[brandywine]

Okay, here's a better photo of the guineas in a nice line-up:

From left to right:

Rear view of "pearl" guinea, showing solid-ish feathering on back
Lavender guinea
"Brown pearl" guinea
Buff Orp interloper
2 "pearl" guineas
Another lavender guinea

I hate to think that I got a bunch of slates or something. I really love the natural pearl coloring, and the individual shed feathers of a pearl guinea are a wonder of nature.

 

[sweetshoplady]

Those gray ones are lavender. Same color as mine.

 

[HidingInTheHenHouse]

Only the 1 pearl in the middle looks like a true pearl. The other three "pearls" look like a mix of some kind, but I don't know what colors.