Is Zirconia a Diamond?

When it comes to gemstones, diamonds have always held a special place in people's hearts. Known for their brilliance and durability, diamonds are highly sought after. However, there are other gemstones that closely resemble diamonds, such as zirconia. But is zirconia really a diamond? Let's find out.

What is Zirconia?

Zirconia, also known as cubic zirconia, is a synthetic gemstone that is made to resemble a diamond. It is created by heating zirconium oxide powder to extremely high temperatures, resulting in a crystal structure that closely resembles a diamond. Due to its affordability and diamond-like appearance, zirconia has become a popular alternative to diamonds in jewelry.

Physical Properties

While zirconia may look similar to a diamond, it has different physical properties. Diamonds are the hardest known natural substance, scoring a perfect 10 on the Mohs scale of mineral hardness. On the other hand, zirconia has a hardness of around 8-8.5 on the Mohs scale, making it less durable than a diamond.

Additionally, diamonds have a higher refractive index than zirconia, which means they reflect and refract light differently, resulting in their characteristic sparkle. Zirconia, although it can be quite brilliant, does not possess the same level of brilliance as a diamond.

Chemical Composition

Chemically, diamonds and zirconia are also different. Diamonds are made up of carbon atoms arranged in a crystal lattice structure, while zirconia is composed of zirconium and oxygen atoms. This difference in composition contributes to the variation in their physical properties.

Price Comparison

One of the main reasons why zirconia is often used as a diamond substitute is its affordability. While diamonds can be quite expensive, zirconia is a more budget-friendly option. However, it's important to note that the value of a diamond goes beyond its physical properties. Diamonds are rare and have a long-standing cultural significance, which contributes to their higher price.


So, is zirconia a diamond? The answer is no. While zirconia may closely resemble a diamond in appearance, it has different physical and chemical properties. Diamonds are known for their exceptional hardness, brilliance, and rarity, which sets them apart from other gemstones. However, zirconia can be a great alternative for those who desire the look of a diamond at a more affordable price.

When it comes to choosing between a diamond and zirconia, it ultimately depends on personal preference and budget. Both gemstones have their own unique qualities and appeal. Whether you opt for the timeless beauty of a diamond or the affordability of zirconia, the choice is yours.

Leave a comment

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


View all
Costume Jewelry Trends