Description Lab Created Ruby #8 Rounds These are AAA quality diamond cut rounds. This material is Lab Ruby #8 (darker red), we also have Lab Ruby #5 Available in many shapes/sizes. Lab Created Ruby have a hardness of 9 on the Mohs scale, just like natural rubies, making them durable and suitable for various jewelry applications. Their crystal structure, refractive index, and specific gravity are also akin to natural rubies. However, lab created rubies often have fewer inclusions and imperfections than most natural rubies, resulting in a clearer and often more brilliant appearance.