It’s one of the most common questions people ask before making the switch from natural to lab-grown stones. And for good reason.
Just like natural diamonds, lab-grown diamonds can be certified by reputable laboratories such as GIA (Gemological Institute of America) and IGI (International Gemological Institute), which assess each diamond’s cut, colour, clarity, and carat weight.
A certificate acts as a guarantee of authenticity and transparency, giving you the same confidence you’d expect when purchasing a mined diamond.
You should, according to where you buy them.
Normally, lab-grown diamonds come with a certification issued by independent gemological laboratories. These reports outline the stone’s key characteristics (its carat weight, clarity, colour grade, and cut quality) based on the same standards used for natural diamonds.
At GS Diamonds, each lab-grown stone is carefully assessed and sold with a recognised certificate from respected organisations such as the GIA or the IGI.
These are the two leading authorities in lab diamonds certification, trusted worldwide for their precision and credibility.
If you’d like to take a step back and understand more about how these stones are created, explore our full guide on what lab-grown diamonds are.
Not all lab-grown diamonds on the market are certified, and this is where you should be cautious. Certification is optional, which means some sellers may offer uncertified stones to reduce costs.
However, purchasing a diamond without certification means you can’t independently verify its quality or origin. In other words, you won’t know if what you’re buying is what you’re promised.
For peace of mind, always choose lab diamonds that are certified, from trusted jewellers who can provide documentation from recognised laboratories. This ensures full transparency and value for your investment!
If you’re still weighing your options, or just wondering if lab grown diamonds hold their value, you can also read our guide for more clarity on long-term worth.
The certification process for lab-grown diamonds mirrors that of natural ones. Once created, each diamond is sent to an independent gemological lab where it undergoes a detailed evaluation.
Specialists examine the diamond’s 4Cs, using standardised tools and grading systems. The laboratory then issues a certificate, which includes:
The grading process is entirely objective, ensuring consistency and reliability across all certified stones.
Actually, the best certification depends on what you value most. The GIA is widely considered the global authority on diamond grading, known for its strict standards and reputation for excellence.
Meanwhile, the IGI is also highly respected and more commonly used for lab-grown diamonds, offering comprehensive detail and faster turnaround.
Both organisations follow internationally recognised grading principles. Choosing a lab diamond with either IGI or GIA certification ensures you’re purchasing a high-quality, ethically produced stone that meets the same benchmarks as mined diamonds.
So, answering your first question: “Are lab diamonds certified?” they can be.
But beyond that, keep in mind: certified lab-grown diamonds are every bit as durable and remarkable as their natural counterparts. Their certification provides assurance of authenticity, quality, and ethical sourcing.
This way, you can celebrate your life’s biggest moments with a stone that’s ethical, stunning, sustainably grown and around 20-30% more affordable than its cousin.
At GS Diamonds, we love our lab-grown stones just as much as our natural ones. If you’re ready to take the next step or surprise your partner with a gift, explore our full collection of certified lab grown diamonds. There’s a perfect piece for every taste!
