Confidence: I'm as sure as I can be.
Notes: Gardiner's skink is a burrowing species which are small, slender and dark-coloured. They burrow into forest leaf-litter and don't tend to climb. This fits the general description of the Seychelles skink which is common in a variety of habitats. There are some similar species although none are found on Curieuse as far as I can tell.