Ive had this on my site for some time, but thought it might be usefull to share here as well. Hope it helps if your trying to figure out what morph your crested is.

Fire / Flame:
The flame or fire morph is characterized by a lighter color pattern appearing over a darker base color on the center of the gecko’s back. Examples of the fire/ flame morph come in many colors. A gecko does not have to be any two particular colors to qualify as a fire/ flame morph. Rather, it simply must have a lighter color pattern visible running down the center of the back over a darker base color that ideally encompasses the rest of the gecko. The lighter fire /flame color may also be visible to a small degree on the gecko’s sides and legs. When the lighter color appears in these secondary areas in a greater amount the gecko is referred to as a harlequin or harley for short.

In the displayed example, the blackened area shows the lighter colored area running down the back that qualifies this gecko as a fire or flame morph.




Harlequin, AKA Harley:
The harlequin morph, or harley for short is an exaggerated version of the fire or flame morph. For a gecko to qualify as a harlequin, it must have a lighter fire or flame pattern visible down the dorsum just as a fire/flame morph does. The distinguishing factor between a fire/flame and a harlequin is the amount this lighter color pattern appears on the gecko’s sides and limbs. A fire may have a little of this secondary color on the limbs, but when it shows up in greater amounts the gecko is referred to as a harlequin. As this is a desired trait breeders are constantly producing harlequins with exaggerated amounts of this lighter color. Some harlequin geckos now appear to have more of the lighter color on the legs and sides than the base color. Generally speaking the greater the amount of the secondary color the more desirable the gecko is.

In the displayed examples, the blackened area shows where the lighter color runs down the back qualifying the gecko as a fire morph. Additionally, the black and white striped area showcases where the pattern has extended to the sides and limbs, thus qualifying the gecko as a harlequin.