Sardonyx
This highly-protective stone carries a vibration of happiness, optimism and confidence. Great for boosting your personal power and your self control. Sardonyx is also an excellent grounder for bringing you back to earth after spiritual work. Because it enhances motivation, willpower, this crystal makes a great choice when it comes to studying or if your job requires mental discipline for the task at hand. It's also believed to be an attractor of friends and fortune.