A grading report tells you about the cut, colour, clarity, and carat weight of your diamond. The information is neatly documented, and independently verified.
What it doesn't tell you is what the diamond looks like in actual use. Across the dinner table. Under office lighting at 11am. That's the gap GemEx diamond certification was made for.
Table of Contents- Why GemEx Certification Matters
- How GemEx Measures Diamond Brilliance, Fire and Sparkle
- What Is Included in a GemEx Diamond Certification Report?
- GemEx Certified Diamonds vs Traditional Diamond Certifications
- Should You Consider GemEx Certification When Buying a Diamond?
- A traditional grading report contains information about the cut, colour, clarity and carat weight of the diamond.
- GemEx looks at how the diamond behaves with light.
- GemEx measures the brilliance, fire and scintillation. Three ways that explore the diamond's light performance.
- A 3VH rating means the diamond achieves a Very High score in all three GemEx measures.
- GemEx certification does not replace an IGI or GIA certificate. The two reports assess different things and are best read together.
- For a solitaire, where the diamond is doing almost all the visual work, light performance can be an important part of the buying decision.
- GemEx certified diamonds are not automatically “better”. The value of the report is that it gives you independently measured information rather than leaving you to infer light performance from the 4Cs.
Why GemEx Certification Matters
Two diamonds can carry identical grades on a traditional certificate and look noticeably different once worn. Same carat weight. Same colour. Same clarity. Different cut. Different light performance.
The 4Cs describe the diamond from a grading point of view. Its carat weight, its colour, the clarity and cut. But it doesn’t tell you how it plays with light.
GemEx certification fills that gap. It measures light performance directly, under standardised conditions, rather than inferring it from grading characteristics. Two diamonds with identical traditional grades can behave quite differently in real light. The GemEx scores show that difference.
At Aukera, lab grown diamonds across the solitaire collections go through Light Science™ evaluation for this reason. A grading report doesn't answer the light performance question.
How GemEx Measures Diamond Brilliance, Fire and Sparkle
GemEx uses a proprietary instrument called the BrillianceScope. It measures three things, each describing a different quality of what the eye sees when it looks at a diamond.
Understanding Diamond Brilliance
Brilliance is white light coming back out of the diamond. Cut it well and light goes in, hits the internal facets and returns upward through the crown. That's what people are responding to when a diamond catches their eye across a room.
GemEx records how much white light the diamond returns under standardised conditions and assigns a score.
How GemEx Evaluates Fire
White light enters the diamond, splits into its component colours on the way out, and you get flashes of red, blue, orange. That's fire. Some diamonds throw it strongly. Others barely at all. The GemEx report measures it independently rather than assuming it from the cut grade.
How Sparkle Is Measured in GemEx Reports
Sparkle is movement. As the diamond shifts or the light changes, bright and dark areas flash across the surface. That contrast is what makes a diamond look alive rather than just bright.
GemEx scores scintillation separately because a diamond can do well on brilliance and fire and still show less movement than expected. Or the reverse. The three scores together describe the diamond's light behaviour more completely than any single metric does on its own.
What Is Included in a GemEx Diamond Certification Report?
Brilliance, fire and sparkle scores, each rated from Low through Medium, High and Very High. Alongside the scores, imaging shows how the diamond performs visually under the BrillianceScope.
A diamond achieving Very High across all three simultaneously reaches what GemEx designates as 3VH. That's the benchmark Aukera's Enhanced Hearts & Arrows™ collection is held to.
The report doesn't include traditional grading information. It's not a replacement for an IGI or GIA certificate. It answers a different question.
GemEx Certified Diamonds vs Traditional Diamond Certifications
| Factor | GemEx Certification | Traditional Diamond Grading Report |
|---|---|---|
| Primary focus | Light performance | Diamond grading characteristics |
| Brilliance | ✓ | – |
| Fire | ✓ | – |
| Scintillation | – | – |
| Carat weight | – | ✓ |
| Colour | – | ✓ |
| Clarity | – | ✓ |
| Cut | – | ✓ |
| Replaces traditional certificates? | No | No |
The two documents cover different ground. A traditional grading report tells you what the diamond is. GemEx tells you how it performs. Neither replaces the other.
Should You Consider GemEx Certification When Buying a Diamond?
Two diamonds with matching traditional grades can look quite different once worn. The GemEx scores give you something concrete to compare rather than having to take the difference on faith.
For solitaires especially, one diamond doing all the work, light performance is worth understanding properly before deciding. A diamond that grades well but scores low on GemEx metrics will look different from one that scores Very High. That difference shows every day.
Lab grown diamond earrings and lab grown diamond mangalsutra at Aukera follow the same certification approach across the collection. Where light performance defines the design, GemEx sits alongside IGI documentation rather than replacing it.
GemEx certified diamonds aren't automatically superior to uncertified ones. The report is information, not a ranking. What it provides is an independently measured record of how the diamond behaves in light, which is more useful than inferring performance from grades alone.
