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The Gem of Self-Confidence is one of the gem stones the Winx will had to acquire to earn the Sirenix transformation. It is located in Royal Deeps of Solaria, inside a cave where it was placed into a silver shield which was found by Stella. The Shield was able to reflect the dark spell thrown by mutant jellyfish (which accidentally mutated because of Tritannus who came through the Ocean Gate of Solaria) and free Flora from the spell that turned her into a stone.
The Gem of Self-Confidence is colored blue and in the Sirenix Box, it is located in highest point of a star along with a red gem being at its left side and orange gem being at its right side.
Like the other gems, they must solve two riddles for this gem and must seek for it in the ocean of Andros and Solaria.