Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes.
Amber eyes in sunlight – displaying an orange color rather than brown
Amber eyes are of a solid color and have a strong yellowish/golden and russet/coppery tint. This may be due to the deposition of the yellow pigment called lipochrome in the iris (which is also found in green eyes). Amber eyes should not be confused with hazel eyes; although hazel eyes may contain specks of amber or gold, they usually tend to comprise many other colors, including green, brown and orange. Also, hazel eyes may appear to shift in color and consist of flecks and ripples, while amber eyes are of a solid gold hue. Even though amber is considered to be like gold, some people have russet or copper colored amber eyes that many people mistake for hazel, though hazel tends to be duller and contains green with red/gold flecks, as mentioned above. Amber eyes may also contain amounts of very light gold-ish gray.
Are people with amber eyes more likely to be rh negative?
and:
Are rh negatives more likely to have amber eyes?
I have looked through a list of celebrities with amber eyes and at the worldwide frequencies but so far there has not been any location that stood out in terms of high rh negative frequencies.
Amber eyes of course are very rare as is rh negative blood. Actually the most rare eye color there is.
So are amber eyes an “rh negative trait”?
There seems to be a high frequency of hazel eyes amongst rh negative individuals, but amber has not shown indication (yet) as being more frequent amongst rh negatives or rh negatives being more likely to have amber eyes.