1.5-2"
Random pull 
Your piece will be (if not the exact picture) quite similar!
 
Lapis Lazuli is one of the most sought after stones in use since man's history began. Its deep, celestial blue remains the symbol of royalty and honor, gods and power, spirit and vision. It is a universal symbol of wisdom and truth.
 
Please see our Crystal Lore Section for more info on this amazing stone!