I'm not as familiar with jewelled as I am the red-sided ones, but I do know that they're both from the same regions in Haiti so their care is very similar 
Jewelled curly-tails are more properly known as Leiocephalus personatus. They will reach a total length of 23-28cm (~9-11 inches)and males are a bit larger than females. The name curly-tail comes from their behaviour or curling and waving their tails when frightened or when communicating with other curly-tails. They are a very curious, and sometimes comical, species of lizard, that is a great and interesting to watch hands-off pet when cared for properly.
For a pair, you should have no less than a 20 gallon (long-style) aquarium, bigger is better. Glass aquariums work well because these lizards need a rather high humidity, but the cover shgould be screen to allow ventilation. Don't house males together, as they are quite territorial. Luckily, this species is very noticeably sexually dimorphic: Males are MUCH more colourful than females! Males are splashed with orange, red, green and a bit of blue, whereas females are a mottled brown, light gray and black (sometimes with a bit of red on the underside of their tail), with a large band of black (outlined in white) on each side.
Daytime temperatures can range from 25-30C (77-86F), with a basking spot of about 35C (95F). At night, don't let the temperatures drop below 18C (64F).
During the day, these lizards require UVB-producing fluorescent lighting. ReptiGlo 8.0 (be Tetra Terrafauna) or Repti Sun 8.0 (by Zoo Med) are both good choices. Be sure that you get the 8.0 "wattage" specifically, as these lizards come from a place where they gets lots of direct sunlight near the equator, so the UVB index there is quite high.
These lizards are from a beach-like habitat that is very hot and humid, yet dry. To achieve the high level of humidity (50-60%) that these lizards need, the substrate can be layered. The bottom layer should be a sbout an inch and a half of dampened mulch-soil-peat mix, and on top of that, a few inches of very fine grain aquarium sand. They love to burrow themselves beneath the warm sand. Be sure to get VERY small grained sand, as sand that is too coarse has a greater chance of causing an intestinal impaction if accidentally swallowed. Also, provide a wide, shallow water dish. A wide dish will evaporate more water in a given period of time, increasing the humidity in the enclosure.
Pieces of driftwood, bark, and rock formations are great cage furniture for this type of lizard. They more specifically love the rocks! Be sure that any cage furniture is firmly planted in the bottom of the tank: Rocks and branches simply sitting on top of the sand can become hazards to these burrowing lizards, who may become crushed by burrowing beneath a rock or branch that's only standing on the sand. If you want to decorate the enclosure further with live plants, thick, harder (and non-prickly) succulents will work. Leave them in the pots they come in, and simply sink them up to their rim in the substrate. The reason for this is so that the burrowing curly-tails won't disrupt any of their roots.
I hope this helped some! If I missed anything, don't be shy to ask more!
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Christina Miller
Herptiles.org
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