Gray eyes are the lightest of all human eye colors and amber is the rarest human eye color. It's even more rare than green color. Amber eyes were the second mutation from black color eyes with the appearance of white Europeans. The first mutation from black-color eyes was brown eyes, then amber, then so on. Therefore, amber eyes obviously originated in Europe and are found, mainly, in Italy, Germany and Switzerland.
Amber eyes should not be confused with hazel eyes as amber is a solid gold color that does not shift in appearance to any other color.
This color is more common in animals and rarely seen in people of any race other than white.