These trendy adjustable Rings are designed with Zircon stone and Cubic Zirconia! 
They are also gold plated and nickel free. 
Here is some properties of Zircon stone: 
Zircon is used to aid in meditation and developing psychic intuition. It is said to clear negative energy and has a protective aura. Other properties attributed to zircon are that it can attract wisdom, success, honor and wealth.