Is a lab grown diamond the same as cubic zirconia?

Is a lab grown diamond the same as cubic zirconia

No, a lab-grown diamond is not the same as cubic zirconia (CZ). While both lab-grown diamonds and cubic zirconia are synthetic materials used as diamond substitutes, they have distinct differences:


  • Lab-grown diamonds are created using advanced technological processes that replicate the crystal structure and chemical composition of natural diamonds, which is primarily composed of carbon atoms arranged in a diamond cubic lattice. This makes lab-grown diamonds chemically identical to natural diamonds.
  • Cubic zirconia, on the other hand, is a different material altogether. It is made from zirconium dioxide (ZrO2) and lacks the same carbon structure found in diamonds.


  • Lab-grown diamonds have a hardness of 10 on the Mohs scale, which is the highest possible level of hardness. They are incredibly durable and can scratch most other materials, including other gemstones.
  • Cubic zirconia is much softer in comparison, with a hardness of approximately 8-8.5 on the Mohs scale. This means it is more susceptible to scratching and wear over time.

Optical Properties:

  • Lab-grown diamonds exhibit many of the same optical properties as natural diamonds, such as high brilliance, fire, and sparkle. They also have a similar refractive index.
  • Cubic zirconia has different optical properties from diamonds, often displaying more intense flashes of color (fire) and greater sparkle, but it lacks the same dispersion and scintillation characteristics of diamonds.


  • Lab-grown diamonds are generally more expensive than cubic zirconia due to the cost associated with their production methods and their closer resemblance to natural diamonds.

Market Use:

  • Lab-grown diamonds are used in jewelry and engagement rings as an ethical and sustainable alternative to natural diamonds. They are highly valued for their chemical and physical similarity to natural diamonds.
  • Cubic zirconia is also used in jewelry but is typically considered a more affordable and less valuable alternative to both natural and lab-grown diamonds.

In summary, lab-grown diamonds and cubic zirconia are distinct materials with different chemical compositions, properties, and uses. Lab-grown diamonds closely mimic natural diamonds in terms of composition and properties, while cubic zirconia is a separate, man-made gemstone with its own characteristics.