The Trusted IGI Certificate for Lab-Grown Diamonds in New Zealand

What Is an IGI Certificate

When buying a diamond — whether natural or lab-grown — one of the most important things to look for is independent certification.
An IGI Certificate, issued by the International Gemological Institute (IGI), is an official grading report that verifies a diamond’s quality. It details the stone’s cut, colour, clarity, and carat weight, along with other key features such as polish, symmetry, and fluorescence.

For lab-grown diamonds, an IGI certificate provides transparency and assurance that your diamond is exactly as described — created ethically in a laboratory, yet every bit as real and brilliant as a mined diamond.

Why IGI Certification Matters

In New Zealand’s growing lab-grown diamond market, not every jeweller offers certified stones. Buying an IGI certified diamond means you’re investing in trust, quality, and value.
The certificate acts like a “diamond passport,” recognised by jewellers and gem experts worldwide. It helps you:

• Understand exactly what you’re purchasing
• Compare diamonds based on clear, objective grading
• Protect the long-term value of your jewellery
• Shop with confidence, knowing your diamond is independently verified

At Lumora Diamonds, every lab-grown diamond above 0.30 ct comes with an authentic IGI certificate, ensuring full transparency for our customers.

How IGI Grades Lab-Grown Diamonds

The IGI follows the same internationally accepted 4Cs grading system used for mined diamonds:

• Cut: The precision and proportion that determine sparkle and brilliance
• Colour: Graded from D (colourless) to Z (light yellow or brown)
• Clarity: Evaluates internal inclusions and external blemishes
• Carat Weight: The diamond’s size and weight

Additionally, IGI reports note that the diamond is “Laboratory Grown”, confirming its ethical origin. Advanced testing ensures every stone is authentically lab-created, not mined or synthetic simulants like moissanite or cubic zirconia.

IGI vs GIA: What’s the Difference?

Many buyers have heard of both IGI and GIA certificates. While both are respected, IGI is particularly known for being the global leader in lab-grown diamond grading.IGI was one of the first institutes to officially grade lab-created diamonds, developing advanced procedures that reflect their unique production process. This makes IGI certification the preferred choice among leading lab-grown diamond jewellers worldwide — including Lumora Diamonds.

While Lumora Diamonds proudly chooses IGI certification as our standard for lab-grown diamonds, we understand that some customers may prefer a GIA certificate instead. Simply contact our team before placing your order, and we’ll be happy to arrange a GIA-certified option specially for you.

Why Choose Lumora Diamonds and IGI Certified Stones

At Lumora Diamonds, based in Auckland, New Zealand, we believe that buying fine jewellery should be a transparent and empowering experience.
Each of our lab-grown diamonds is IGI certified, ensuring it meets the highest global standards of quality and ethics. You can view the certificate details for every diamond before you buy — either online or in-store — so you know exactly what makes your stone special.

By choosing IGI certified lab-grown diamonds, you’re not only embracing modern luxury, but also supporting a more sustainable and ethical jewellery industry.

Final Thoughts

When it comes to choosing a diamond, certification is key. An IGI certificate gives you confidence that your diamond is genuine, ethically sourced, and accurately graded. At Lumora Diamonds, we’re proud to offer only IGI certified lab-grown diamonds — combining beauty, integrity, and affordability.

Beyond grading accuracy, an IGI certificate also adds long-term value to your jewellery purchase. In the future, if you ever wish to upgrade, trade, or insure your diamond, having an official IGI report will make the process easier and more transparent. Insurance providers and jewellers across New Zealand recognise IGI-certified stones because of the institute’s strong international reputation for integrity and consistency.

Moreover, as lab-grown diamonds continue to rise in popularity among conscious buyers, certification ensures that your purchase aligns with both ethical standards and modern luxury values. At Lumora Diamonds, our goal is to help you make an informed choice — one that balances beauty, responsibility, and long-lasting worth.

✨ Discover your perfect IGI certified diamond today at Lumora Diamonds — Auckland’s trusted destination for lab-grown luxury.