Dumortierite - Lighter in Color

Dumortierite
Assists in communication with angelic or spirit guides
A stone of the mind
Strengthens mental acuity and memory, especially in areas related to math and language
Promotes confidence and a positive attitude toward life
By sharpening focus and acuity, can help strip self doubt and heighten one's ability to stand up for one's self
 
Please note:  These are a much lighter shade of blue than the others I have listed.  I purchased these a few years ago from a company which no longer has these available.  They are more rounded.  They have the same metaphysical properties as the darker ones.  I have a limited supply of these and no way of replacing them.