Lab-grown diamonds and cubic zirconia are both popular alternatives to natural diamonds, but they are fundamentally different in terms of composition, properties, and overall value. In this article, we'll explore the differences between lab-grown diamonds and cubic zirconia, and why lab-grown diamonds are not the same as cubic zirconia.

Composition and Formation

Lab-Grown Diamonds

Lab-grown diamonds are created using advanced technological processes that replicate the natural conditions under which diamonds form. There are two primary methods for growing diamonds in a lab:

1. High Pressure High Temperature (HPHT): This method involves subjecting a carbon source to high pressure and high temperature, resulting in diamond formation.
2. Chemical Vapor Deposition (CVD): This method involves placing a carbon-rich gas mixture in a vacuum chamber. The gas is then heated, causing carbon atoms to settle on a substrate and form a diamond crystal.

Lab-grown diamonds are composed of pure carbon, just like natural diamonds. They have the same chemical, physical, and optical properties as natural diamonds, making them virtually indistinguishable.

Cubic Zirconia

Cubic zirconia (CZ) is a synthetic gemstone made from zirconium dioxide. It is created by melting powdered zirconium and zirconium dioxide together, and then cooling the mixture to form a crystal. Cubic zirconia is not a diamond and does not share the same chemical composition or properties as diamonds.

Physical Properties

Lab-Grown Diamonds

• Hardness: Lab-grown diamonds have a hardness of 10 on the Mohs scale, the same as natural diamonds. This makes them extremely durable and resistant to scratching.
• Brilliance: Lab-grown diamonds exhibit the same brilliance and sparkle as natural diamonds due to their identical crystal structure.
• Density: Lab-grown diamonds have the same density as natural diamonds, giving them a substantial feel.

Cubic Zirconia

• Hardness: Cubic zirconia has a hardness of 8-8.5 on the Mohs scale, making it less durable than diamonds and more prone to scratching.
• Brilliance: Cubic zirconia has a lower refractive index than diamonds, resulting in less brilliance and sparkle.
• Density: Cubic zirconia is less dense than diamonds, making it feel lighter in weight.

Value and Cost

Lab-Grown Diamonds

Lab-grown diamonds are generally more affordable than natural diamonds, but they still hold significant value due to their identical properties. The cost of lab-grown diamonds varies based on factors such as carat weight, cut, color, and clarity. They are a popular choice for those seeking a real diamond at a lower price point.

Cubic Zirconia

Cubic zirconia is much less expensive than both natural and lab-grown diamonds. While it can be a cost-effective alternative for those on a tight budget, it does not have the same value or longevity as diamonds. Over time, cubic zirconia may become cloudy and lose its sparkle.

Conclusion

Lab-grown diamonds and cubic zirconia are distinct in terms of composition, properties, and overall value. Lab-grown diamonds are real diamonds with the same chemical, physical, and optical properties as natural diamonds, making them a valuable and durable option. Cubic zirconia, on the other hand, is a synthetic gemstone that does not match the hardness, brilliance, or value of diamonds.