The most common Himalayan genotype is a non-agouti black, but there are other possible combinations that can appear.
Agouti, Solid, and Tan Himalayan
Agouti Himalayan Genotype: A
Solid Himalayan Genotype: ar
Tan Himalayan Genotype: at
Eye Color: Pink
ARBA: Not accepted
ANCC: Accepted in longhairs only
BCC: Accepted in longhairs only
NZCC: Accepted in longhairs only
OCC: Not accepted
When Himalayan is combined with a higher A allele, it will result in incomplete or frosty markings. Though these may be showable as a Himalayan, they will be faulted for poor markings.
Non-Black Himalayans
Genotype:
Eye Color: Pink
ARBA: Not accepted
ANCC: Accepted in longhairs only
BCC: Accepted in longhairs only
NZCC: Accepted in longhairs only
OCC: Chocolate only accepted as a rare variety
Chocolate Himalayans are actually quite attractive and if one is not familiar with the variety, could potentially be mistaken for a true Himalayan. Beige and Lilac Himalayans are very pale, it is thought they may even be able to be shown as a White if the markings are light enough.
Spotted or Roan Himalayan
Spotted Himalayan Genotype:
Eye Color: Pink
ARBA: Not accepted
ANCC: Accepted in longhairs only
BCC: Accepted in longhairs only
NZCC: Accepted in longhairs only
OCC: Chocolate only accepted as a rare variety
It is hard to see spotting or roaning on the Himalayan since the majority of the body is white. The most noticeable thing would be a missing marking – a Himalayan without a nose marking or with a white foot. They could also have a white spot in the middle of the nose smut. The only other way to know is if a roan or broken cavy is produced when the Himalayan is bred with a self. The hidden roan gene can cause problems if two Himalayans hiding roan are bred together and it results in lethal whites.
Combinations of the Above
Any of the above can be combined as well. For example, you could have a Broken Roan Dilute Agouti Himalayan, though this would be extremely rare!