Are Lab Grown Diamonds Cubic Zirconia?

When it comes to sparkling gemstones, the terms lab-grown diamonds and cubic zirconia often surface in conversations. While both can create dazzling jewelry, these two materials are fundamentally different in terms of composition, quality, and value. At Plateau Jewelers in Sammamish, WA, we frequently help our customers understand the nuances of fine jewelry, and this topic is no exception.

Let’s dive into the details to explore whether lab-grown diamonds are the same as cubic zirconia—and why it’s essential to understand the distinction.

What Are Lab-Grown Diamonds?

Lab-grown diamonds are real diamonds created in controlled laboratory environments that replicate the natural process of diamond formation. Using advanced technology, scientists create these diamonds with the same chemical composition, crystal structure, and optical properties as natural diamonds.

Key Characteristics of Lab-Grown Diamonds

  • Chemical Composition: Pure carbon, identical to natural diamonds.

  • Structure: Lab-grown diamonds are crystalline, forming a true diamond lattice.

  • Appearance: They are indistinguishable from natural diamonds to the naked eye.

  • Durability: With a Mohs hardness of 10, lab-grown diamonds are just as durable as natural diamonds.

Lab-grown diamonds are often certified by gemological institutes like the GIA or IGI, ensuring their quality and authenticity.

What Is Cubic Zirconia?

Cubic zirconia (CZ) is a synthetic gemstone made from zirconium dioxide, commonly used as a diamond simulant due to its affordability and sparkle. While cubic zirconia can resemble a diamond in appearance, it is a fundamentally different material.

Key Characteristics of Cubic Zirconia

  • Chemical Composition: Zirconium dioxide, a completely different compound from diamond.

  • Structure: Cubic zirconia is not crystalline but has a cubic structure.

  • Appearance: It offers brilliance but lacks the depth and fire of a diamond.

  • Durability: With a Mohs hardness of 8.5, CZ is softer than a diamond and more prone to scratching and wear.

Cubic zirconia is not graded or certified like diamonds because it is not a natural or lab-grown gemstone.

Comparing Lab-Grown Diamonds and Cubic Zirconia

Although lab-grown diamonds and cubic zirconia may look similar at first glance, they differ significantly in several key areas:

1. Composition and Structure

  • Lab-Grown Diamonds: Made of pure carbon, forming a genuine diamond structure.

  • Cubic Zirconia: Composed of zirconium dioxide, lacking the crystalline diamond structure.

2. Appearance

  • Lab-Grown Diamonds: Display the brilliance, fire, and scintillation of natural diamonds, with depth and complexity in their sparkle.

  • Cubic Zirconia: While brilliant, CZ can appear overly bright and lacks the nuanced sparkle of a diamond. Over time, CZ may also lose its luster due to scratches.

3. Durability

  • Lab-Grown Diamonds: With the same hardness as natural diamonds, they are highly resistant to scratches and suitable for daily wear.

  • Cubic Zirconia: Softer and more prone to scratches, making it less durable over time.

4. Value

  • Lab-Grown Diamonds: Considered valuable, with a price reflective of their quality and craftsmanship.

  • Cubic Zirconia: A budget-friendly alternative but significantly less valuable.

Explaining the Confusion

The confusion between lab-grown diamonds and cubic zirconia often stems from their similar appearance. Both materials can sparkle beautifully, making it easy to mistake one for the other without proper knowledge. Additionally, the term "synthetic" is sometimes used inaccurately, leading to misunderstandings about what lab-grown diamonds truly are.

Quick Clarification

  • Lab-grown diamonds are real diamonds with the same physical, chemical, and optical properties as natural diamonds.

  • Cubic zirconia is a diamond simulant, designed to mimic the appearance of a diamond but fundamentally different in composition and value.

How to Tell the Difference

While lab-grown diamonds and cubic zirconia may look similar to the untrained eye, professionals use specific tools and techniques to differentiate them:

1. Certification

Lab-grown diamonds come with certifications from gemological institutes, detailing their carat weight, cut, clarity, and color. Cubic zirconia does not receive such grading.

2. Thermal Conductivity

Diamonds (natural or lab-grown) conduct heat effectively, while cubic zirconia does not. Jewelers often use thermal conductivity testers to distinguish between the two.

3. Magnification

Under magnification, diamonds exhibit sharp, crisp facets, while cubic zirconia may show rounded edges and a lack of brilliance.

4. Weight

Cubic zirconia is heavier than diamonds of the same size due to its density, which can help differentiate it in certain settings.

The Appeal of Lab-Grown Diamonds

Lab-grown diamonds are ideal for those seeking the beauty and durability of real diamonds. Their affordability compared to natural diamonds also makes them an attractive option without compromising quality. Whether you’re designing a custom engagement ring or selecting a timeless piece for your collection, lab-grown diamonds offer unmatched brilliance and versatility.

The Role of Cubic Zirconia in Jewelry

Cubic zirconia has its place in jewelry as a cost-effective option for fashion pieces or temporary replacements. While it doesn’t match the quality or durability of diamonds, it allows for bold designs at a fraction of the price.

Why Choose Plateau Jewelers?

At Plateau Jewelers, we specialize in helping our customers understand the differences between gemstones to make informed decisions. Whether you’re exploring lab-grown diamonds or looking for a custom design, our team in Sammamish, WA, is here to guide you.

  • Expert Knowledge: With decades of experience, we ensure every customer feels confident in their purchase.

  • Custom Creations: Let us design a one-of-a-kind piece featuring lab-grown diamonds or other gemstones of your choice.

  • Commitment to Quality: From engagement rings to fashion jewelry, every piece reflects our dedication to craftsmanship and elegance.

Conclusion

Lab-grown diamonds and cubic zirconia may look alike at a glance, but they are entirely different in composition, quality, and value. While cubic zirconia serves as an affordable alternative for fashion jewelry, lab-grown diamonds are genuine diamonds, offering brilliance, durability, and timeless elegance. At Plateau Jewelers, we’re here to help you navigate your options and choose the perfect gemstone to match your style and story.

Visit Plateau Jewelers Today

If you’re curious about lab-grown diamonds, cubic zirconia, or any other gemstone, visit Plateau Jewelers in Sammamish, WA. Our friendly, knowledgeable team is here to answer your questions and help you find the perfect piece for any occasion.

 

Back to News