Appropriate fruits for crested geckos are those that are high in calcium. It’s best to have a calcium to phosphorus ratio of 2:1 or better. Ca:P ratios are a common concern among reptile enthusiasts, small mammal keepers, and horse breeders. There are plenty of lists online for fruits and vegetables, but here is a list of common fruits with associated calcium to phosphorus levels.

Ca:P Ratios of Common Fruit

Papaya—-4.5 : 1

Fig————2.5 : 1

Prickly Pear—–2.3 : 1

Raspberries——-1.8 :1

Blackberries——–1.5 : 1

Grapes—————1.4 : 1

Mango—————–1 : 1

Pineapple————–1 : 1

Apple——————-1 : 1

Pears——————-1 : 1.2

Cherries—————-1 : 1.2

Strawberries————-1 : 1.3

Guavas——————–1 : 1.3

Apricots——————-1 : 1.4

Blueberries—————–1 : 1.6

Kiwifruit———————1 : 1.6

Summer Squash————-1 : 1.7

Pumpkin———————-1 : 2.1

Peaches———————–1 : 2.2

Plum—————————-1 : 2.5

Banana—————————1 : 3.1

Nectarine————————-1 : 3.2

Passion Fruit (Purple)—————–1 : 5.6

Sources:

http://www.pangeareptile.com/forums/showpost.php?p=313796&postcount=21
http://www.iguanaden.org/diet/calphosfruit.htm