You now have another choice.
For a long time, there were really only a couple choices in clear, brilliant stones. You had diamond, CZ (cubic zirconia), and glass. More recently, moissanite has arrived in the market as another option.
But the real game-changer in the industry has been lab grown diamonds.
Lab grown diamonds are REAL diamonds. 
Lab grown diamonds share the same chemical composition, physical structure, and optical properties as mined-from-the-earth diamonds. And just like mined diamonds, lab grown diamonds are individually unique, beautiful and durable.
They can be graded by reputable organizations using standard criterion, such as carat weight, color, cut and clarity