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 Brun
The Fawn Isabel is the light form of Isabel. You should not see any of the usual black markings at all.
Brun
Den brune mutation ændrer alt gråt og sort pigment til brunt pigment.
Orangebrystet
Orangebrystet er en autosomal recessiv mutation, som ændrer eumelanin til phaeomelanin.Sortbrystet
The Black Breasted mutation changes the pattern of the markings.
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.