International Gemological Institute
IGI provides grading and identification reports for diamonds and jewelry across international markets.
Commonly seen with natural and lab-grown diamonds.
KRULUXE DIAMOND EDUCATION
Diamond Certification With Clarity and Confidence
Understand diamond grading reports, certification laboratories, report numbers, inscriptions and the information that helps you evaluate a diamond with greater confidence.
WHAT CERTIFICATION MEANS
A Diamond Report Helps Describe What You Are Buying
Diamond certification generally refers to an independent grading report issued by a recognized gemological laboratory.
The report does not simply act as a label. It provides documented information about the diamond so that its characteristics can be reviewed before purchase.
KRULUXE may offer diamonds accompanied by grading reports from recognized laboratories where applicable to the selected stone, product, supplier and market.
RECOGNIZED LABORATORIES
Understanding Major Diamond Laboratories
Different laboratories may issue diamond grading reports. Always review the specific report that accompanies the individual diamond.
Gemological Institute of America
GIA is widely recognized for gemological research, education and diamond grading standards.
Frequently referenced in the global diamond industry.HRD Antwerp
HRD Antwerp provides diamond grading and gemological services for international markets.
Another recognized laboratory used within the diamond trade.
INSIDE A GRADING REPORT
Information You May Find on the Certificate
Exact report details vary by laboratory and diamond type.
Report Number
A unique report or certificate number used to identify the laboratory document.
Carat Weight
The measured weight of the diamond expressed in carats.
Color Grade
A grade describing the body color of the diamond according to the laboratory system.
Clarity Grade
An assessment of internal and external characteristics visible under laboratory examination.
Cut Information
Depending on shape and laboratory, the report may include cut, polish and symmetry details.
Measurements
Dimensions, depth, table percentage and proportion information may be included.
Fluorescence
Some reports describe the diamond's fluorescence response under ultraviolet light.
Comments or Identification
Additional comments, growth method, treatment disclosure or other identification may appear where applicable.
THE 4CS
The Four Core Diamond Characteristics
Cut
Cut relates to how the diamond's proportions, symmetry and polish influence light performance.
Color
Color grading evaluates the degree of body color present in the diamond.
Clarity
Clarity describes the presence and visibility of internal inclusions and external characteristics.
Carat
Carat refers to weight. Two diamonds of identical carat weight can still differ in dimensions, appearance and value.
Natural Diamond Grading Reports
Natural diamonds may be accompanied by independent laboratory reports documenting their measurable gemological characteristics.
Report details should be reviewed against the specific diamond being purchased.
Explore Natural Diamonds →Lab-Grown Diamond Grading Reports
Lab-grown diamonds can also be independently graded and identified by gemological laboratories.
The report should identify the diamond as laboratory-grown or lab-grown where applicable.
Explore Lab-Grown Diamonds →
DIAMOND IDENTIFICATION
Laser Inscription and Report Matching
Some certified diamonds may carry a microscopic laser inscription on the girdle.
The inscription may include a laboratory report number or identification reference.
Verify Report Number
Compare the laboratory report number
with the details supplied
for the diamond.
Match Measurements
Diamond dimensions
and grading information
should correspond with
the accompanying report.
Review Identification
Natural or laboratory-grown
identification should match
the product being offered.
Keep the Report
Store grading reports safely
with purchase documentation
for future reference.
IMPORTANT TO UNDERSTAND
What Certification Does and Does Not Tell You
A report records the laboratory's assessment of the diamond's measurable and observable characteristics.
A grading report does not by itself determine market price, resale value or future appreciation.
Diamonds with similar grades can still vary in visual appearance, proportions and overall character.
Certification should be considered together with images, videos, measurements and product information where available.
KRULUXE APPROACH
Clear Product Information Before You Purchase
KRULUXE aims to provide clear diamond details and certification information where available for the selected product.
01
Diamond Details
Important specifications are presented for review before order confirmation.
02
Certification Information
Laboratory and report details may be provided where applicable.
03
Personalized Assistance
Customers may contact KRULUXE if they require help understanding grading information.
04
Order-Specific Review
Certification availability depends on the specific diamond, jewelry product and supplier.
VERIFY BEFORE PURCHASE
Review the Report for the Exact Diamond
When a grading report is supplied, review the laboratory name, report number, diamond measurements and grading information.
01
Check Laboratory
02
Check Report Number
03
Match Diamond Details
04
Ask KRULUXE if Unsure
CERTIFICATION SUPPORT
Need Help Understanding a Diamond Report?
Contact KRULUXE for assistance with certification, diamond specifications, report details or product selection.
KRULUXE PRIVATE CONSULTATION
Select Your Diamond With Greater Confidence
Explore certified diamond options, custom jewelry and personalized guidance from KRULUXE.