This is a very attractive combination where all black has been reduced while orange has been retained.

Black Breasted Orange Breasted Isabel Fawn male
Isabel Fawn
The Fawn Isabel is the light form of Isabel. You should not see any of the usual black markings at all.
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Fawn
The Fawn mutation changes the black and grey pigments to fawn (brown) pigments.
Black Breasted
The Black Breasted mutation changes the pattern of the markings.
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Orange Breasted
The Orange Breasted mutation causes black areas to become orange.
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Isabel
The Isabel mutation causes black, grey and fawn pigments to be diluted, while the orange pigments remain intact. The degree of dilution can vary.