[3] Illegally wild-caught specimens are widely sold in the pet trade, often falsely promoted as captive-bred.

[1] The two known sites outside protected areas are tiny: one consists of 14 Pandanus trees (the rest has been cleared for banana plantations) and the other is equally close to disappearing.

[4] In the wild, the turquoise day gecko lives exclusively on the (redlisted endemic)[13] screwpine, Pandanus rabaiensis,[3] mostly in the leaf crown.

[1] The forest is seriously threatened by pet collectors,[3] clearing for farmland, illegal logging, increasingly frequent fires,[1] mining of rubies, tourmaline, rhodolite, gold[14] and dolomite and limestone from outcrops on which the screwpines grow.

Males of L. williamsi are bright blue with heavy black throat stripes, visible preanal pores, and hemipenile bulges.

Females can easily be confused with juvenile or socially suppressed males that are also green, sometimes with a bluish cast.

identification guide has been published online by CITES,[16] largely for the use of customs officers (illegal shipments of these geckos are often intentionally mislabelled).

Males of L. williamsi court females with lateral flattening, puffing out of the throat pouch, and head bobbing.

Two to three weeks after copulation, the female lays a clutch of 1 or 2 pea-sized white, hard-shelled eggs which are glued to a surface in a secure, hidden location.

The specific name, williamsi, given to the gecko by British zoologist Arthur Loveridge,[17] honours American herpetologist Ernest Edward Williams.