Not all diamond certificates serve the same purpose.
Some focus on grading. Others include measurements relating to optical performance, craftsmanship and light behaviour.
A GCAL 8X certificate belongs to the second category.
Alongside traditional grading information, the certificate records additional measurements related to optical performance.
The report therefore contains information that would not usually appear within a standard grading certificate.
Table of Contents- What Is GCAL 8X Certification?
- What Makes GCAL 8X Different From Traditional Diamond Certification?
- The 8 Performance Factors Measured by GCAL
- How GCAL Goes Beyond the Traditional 4Cs
- Understanding the Key Differences Between GCAL, GIA and IGI
- Why GCAL 8X Certified Lab Grown Diamonds Stand Out
- What Information Is Included in a GCAL Grading Report?
- How to Verify a GCAL Diamond Certification
- Does GCAL 8X Certification Affect GCAL 8X Lab Diamond Value & Pricing?
- GCAL 8X studies performance-based measurements in addition to traditional diamond grading methodologies.
- A GCAL grading covers the 4Cs alongside brightness, fire, scintillation and symmetry assessments.
- GCAL, GIA and IGI use different report formats and evaluation methods to evaluate diamonds.
- A GCAL certificate may include optical performance information, imaging and verification features.
- Verification can be completed using the certificate number or authentication tools associated with the report.
- GCAL diamond certification is available for both natural and lab grown diamonds.
- Certification documents describe the diamond at the time of grading and form part of the overall evaluation process.
What Is GCAL 8X Certification?
GCAL 8X is a certification issued by the Gem Certification & Assurance Lab (GCAL).
The GCAL certificate includes standard grading details alongside additional recorded measurements, forming a document that extends beyond the traditional 4Cs.
The “8X” designation refers to eight evaluated categories. In addition to cut, colour, clarity and carat weight, the certificate records measurements related to optical performance and symmetry.
Because of this expanded format, GCAL diamond certification is often referenced alongside traditional grading reports, even though both describe the same diamond.
What Makes GCAL 8X Different From Traditional Diamond Certification?
Traditional diamond grading reports measure the cut, clarity, colour and carat weight of the diamond.
A GCAL certificate includes those grading characteristics but does not stop there.
Additional measurements are incorporated into the evaluation process, bringing optical performance into the report alongside traditional grading information.
This broader approach to diamond evaluation aligns closely with Aukera's Light Science™ philosophy. Alongside traditional grading characteristics, Light Science™ examines how diamonds interact with light through brilliance, fire and scintillation.
The 8 Performance Factors Measured by GCAL
The GCAL 8X framework evaluates eight categories:
- Cut
- Colour
- Clarity
- Carat Weight
- Brightness
- Fire
- Scintillation
- Symmetry
Together, these measurements form the basis of the 8X assessment.
How GCAL Goes Beyond the Traditional 4Cs
The traditional 4Cs remain central to diamond grading.
GCAL 8X expands the scope of the evaluation by incorporating measurements associated with light performance and optical precision.
This additional data appears within the certificate itself, providing a broader view of the diamond than grading characteristics alone.
Understanding the Key Differences Between GCAL, GIA and IGI
GCAL, GIA and IGI are established laboratories within diamond certification.
Each issue reports that follow different formats.
GIA and IGI reports focus on grading characteristics such as cut, colour, clarity and carat weight. A GCAL grading report includes these characteristics alongside additional measurements related to optical performance.
The result is a different reporting format rather than a different diamond.
| Feature | GCAL | GIA | IGI |
|---|---|---|---|
| Cut, Colour, Clarity, Carat | Yes | Yes | Yes |
| Light Performance Measurements | Yes | No | No |
| Optical Performance Data | Yes | No | No |
| Certificate Verification | Yes | Yes | Yes |
| Lab Grown Diamond Certification | Yes | Yes | Yes |
Although all three laboratories issue diamond certificates, the structure and content of those reports can differ. The information recorded within a certificate depends on the methodology used by the issuing laboratory.
Why GCAL 8X Certified Lab Grown Diamonds Stand Out
Precision Cut Standards for Lab Grown Diamonds
A GCAL certificate records more than traditional grading characteristics.
The 8X format includes measurements related to brightness, fire, scintillation, and symmetry alongside the standard 4Cs.
These categories form part of the documented assessment contained within the report.
Independent Verification of Diamond Performance
A GCAL report contains independently recorded measurements generated during the certification process.
The information appears within the certificate itself and forms part of the overall assessment.
It’s important to note that in the case of GCAL lab grown diamonds, these measurements don’t replace traditional grading methodologies.
Greater Confidence for Modern Diamond Buyers
A GCAL 8X report contains information relating to both grading characteristics and performance measurements.
The result is a certificate that documents multiple aspects of the same diamond within a single report.
GCAL 8X applies the same certification framework to lab grown diamonds as it does to other diamonds submitted for evaluation.
At Aukera, performance-based assessment forms an important part of the conversation around solitaire diamonds. Collections such as Aukera Hearts & Arrows™, Aukera Extra Brilliant™, Aukera E3™, Aukera 161™ and the Aukera Ashtalakshmi Solitaire™ were developed through an ongoing study of light behaviour, optical precision and diamond performance.
What Information Is Included in a GCAL Grading Report?
A GCAL grading report brings together the standard diamond grading details along with additional performance-related information.
You’ll still see the familiar basics — cut, colour, clarity and carat weight — but the report often goes further by including things like light performance data, optical symmetry insights, imaging and certificate verification features.
Rather than splitting this information across multiple documents, GCAL presents it all in one place, making it easier to review everything about the diamond at once.
Understanding the GCAL Diamond Grading Process
The grading side of the report follows the same core approach used across the industry, assessing key characteristics such as cut, colour, clarity and carat weight.
With GCAL 8X, extra layers of measurement are added on top of this. These additional tests expand the report beyond traditional grading, offering a more detailed look at how the diamond performs and appears.
Key Elements of a GCAL Grading Report
| Section of Report | Information Included |
|---|---|
| Diamond Details | Shape, measurements and carat weight |
| Grading Information | Cut, colour and clarity assessments |
| Light Performance | Brightness, fire and scintillation measurements |
| Optical Assessment | Symmetry-related observations |
| Authentication Features | Certificate number and verification tools |
| Report Identification | Unique certificate record details |
How to Verify a GCAL Diamond Certification
Verification features form part of the certification process itself. Certificate records can be checked using information provided within the report, helping connect the physical diamond with the corresponding certificate record.
Locate the GCAL Certificate Number
Each GCAL certificate carries a unique report number.
The number is used when retrieving or confirming certificate information.
Use the GCAL Verification Tool
GCAL maintains an online verification system linked to certificate records.
The report number is required during the lookup process.
Verify the Diamond Through QR Code Authentication
Certain GCAL certificates include QR-enabled verification features.
Scanning the code provides access to the certificate record associated with that diamond.
Does GCAL 8X Certification Affect GCAL 8X Lab Diamond Value & Pricing?
Pricing and value are influenced by multiple factors, including the characteristics of the diamond itself. Certification forms part of the overall record available for review during evaluation and comparison.
A certificate does not change the physical characteristics of a diamond.
It does change the amount of documented information available about that diamond.
A GCAL certificate includes grading information together with additional recorded measurements. Those records may be reviewed alongside other factors when diamonds are compared or evaluated.
Certification may be reviewed when comparing lab grown diamonds, lab grown diamond pendants, lab grown diamond mangalsutra and lab grown diamond nosepins.
