Insist on quality diamond simulants. It’s a common misconception that all diamond simulant stones are the same. In fact, just like diamonds, there are a number of Quality Levels. Like natural diamond gemstones, diamond simulants such as cubic zirconia stones are graded. They are graded according to carat, color, clarity and cut. The scale used is A to 6A, A being the lowest and AAAAAA being the highest. Quality diamond simulants are used in rings by Luxuria such as the one pictured.