This is a paid asset, but now you can download Gems / Animated / Low Poly Free.
Detail this asset from Unity Store: Original Link
Gems / Animated / Low Poly v1.2 (Latest version)
Collection of low poly gems for your mobile platformers / puzzle games / match 3.
All Gems come with 2 loopable animation cycles – Levitation, Rotation.
Animation preview
Prefabs of all items included. Optimized for Unity 5.
All animations are grouped in a single Animator Controller which is applied to all prefabs. However, specific animations reflecting requested behaviour need to be enabled in the Controller.
Standard (Specular) and Standard Materials for shiny and matte effect.
1024 x1024px TGA textures.
6 colors – Blue / Cyan / Green / Peach / Pink / Yellow
6 shapes – Diamond / Dodeca / Icosa / Octa-01 / Octa-02 / Radiant
Example Scene included.
Triangle count:
Diamond – 24 tris
Dodeca – 36 tris
Icosa – 20 tris
Octa-01 – 8 tris
Octa-02 – 8 tris
Radiant – 28 tris