LAREINE Diamond Encyclopedia
Fancy Color Diamond Certification
A laboratory report gives extraordinary color a verifiable scientific identity. Its most important conclusion is not only what the color is, but whether nature created it.
A rare color can be natural, produced by treatment or grown in a laboratory. These possibilities may look remarkably similar to the unaided eye, yet they belong to entirely different categories of rarity and value.
For an important fancy color diamond, visual inspection and a seller’s description are not sufficient. Independent laboratory analysis must answer three separate questions.
1
Is It Diamond?
The material must first be identified as diamond rather than an imitation or another gemstone.
2
Is It Natural?
The laboratory distinguishes a diamond formed in nature from one grown by technological processes.
3
Is the Color Natural?
A natural diamond can still have treated color. Natural diamond origin and natural color origin must both be confirmed.
The essential distinction
“Natural diamond” describes how the crystal formed. “Natural color” describes how its visible color developed. One conclusion does not automatically prove the other.
Precise terminology
Report or Certificate?
The jewelry trade frequently uses the word certificate, but an independent gemological laboratory issues a grading or identification report. It records the laboratory’s conclusions about the diamond examined at a specific time.
What the report is
A Scientific Description
It documents identity, measurements, weight, color origin, color grade and other characteristics according to the selected service.
What the report is not
A Valuation or Guarantee
It does not set a selling price, guarantee future value, establish legal ownership or replace an expert evaluation of beauty and condition.
Current GIA natural color services
Three Report Types
The appropriate report depends on whether the diamond is loose or mounted, the depth of grading required and whether its rough was analyzed before polishing.
01
Colored Diamond Grading Report
A full quality assessment with color grade, color origin, carat weight, clarity grade and plotted clarity diagram. Designed for loose natural colored diamonds weighing 0.15 carats or more.
02
Colored Diamond Origin Report
A full quality assessment that also provides geographic origin and a GIA report number laser inscription. Available for eligible loose natural colored diamonds of 0.15 carats or more that were submitted for rough analysis.
03
Identification and Origin Report
Establishes color origin for loose or mounted natural colored diamonds of any size. A color grade is included for a loose diamond, but this service does not provide the complete quality assessment of the grading report.
Mounted versus loose
A mounted diamond can be identified and its color origin examined, but a complete grading report requires the diamond to be loose so weight, clarity and other characteristics can be assessed accurately.
Two meanings of origin
Color Origin Is Not Geographic Origin
The word origin appears in both contexts, but the conclusions answer completely different questions.
Color Origin
States whether the diamond’s color is natural or the result of treatment. In complex cases, the conclusion may be undetermined. This is fundamental to classification as a natural fancy color diamond.
versus
Geographic Origin
Connects an eligible polished diamond to a country or region of recovery through analysis performed while it was still rough. It is a separate service and cannot normally be reconstructed from the polished diamond alone.
Beyond visual inspection
How a Laboratory Examines Color
Fancy color origin is established by combining trained observation with advanced instrumentation. The laboratory studies the diamond’s optical behavior and the atomic defects that absorb or emit light.
A Gemological Fingerprint
Microscopy, absorption spectroscopy, fluorescence imaging and photoluminescence can reveal growth structures, trace elements, lattice defects and treatment related features.
No single visible characteristic proves every case. The final conclusion is based on the complete body of evidence and comparison with extensive reference data.
Why treatments require expert testing
Irradiation, heating and high pressure high temperature processes can alter a natural diamond’s color. Some results closely resemble colors created during geological formation.
The decisive report field
Three Possible Color Origin Conclusions
Confirmed
Natural
The observed color is consistent with natural geological formation and no evidence requiring a treated conclusion was found.
Disclosed
Treated
The diamond itself may be natural, but its color has been altered or produced by a process performed after mining.
Unresolved
Undetermined
The available evidence does not allow the laboratory to distinguish natural color from treatment with sufficient confidence.
Undetermined is not confirmed natural
This conclusion is especially relevant to certain radiation related green and blue diamonds. An undetermined stone should not be represented as having laboratory confirmed natural color.
Reading the document
The Fields That Matter Most
Begin with identity and color origin before considering the quality grades. The educational example below illustrates how the principal information fits together.
Natural Colored Diamond Report
Report number0000000000
DescriptionNatural Diamond
ShapeOval Modified Brilliant
MeasurementsIllustrative only
Carat weight1.00 carat
Color originNatural
Color gradeFancy Intense Yellow
DistributionEven
Clarity gradeSee actual report
CommentsTreatments and observations
Read in This Order
- Confirm the description states natural diamond.
- Find the color origin conclusion.
- Read the complete grade, including every modifier.
- Check whether color distribution is even or uneven.
- Review weight, measurements and shape together.
- Study clarity, plot, finish, fluorescence and comments.
- Match the report number and physical diamond.
Illustration only
The document above is not a laboratory report, does not reproduce a GIA format and cannot be used to identify a diamond.
Authentication before purchase
How to Verify a Report
A genuine report must correspond to the diamond being offered. Checking the document alone is only the beginning.
- Search the number
Enter the report number and carat weight in the issuing laboratory’s official online database.
- Compare every field
Match shape, measurements, weight, color, clarity and comments with the archived record.
- Match the diamond
Use the clarity plot, measurements and any verified laser inscription to connect the document to the physical stone.
- Consider reexamination
For a valuable diamond with an older report or uncertain history, an independent update or verification can reveal later damage, recutting or alteration.
The report is essential, not complete
What Certification Cannot Tell You
Two diamonds can share the same laboratory description and still differ visibly. A report establishes facts, but connoisseurship begins where standardized fields end.
Market Value
A grading report is not an appraisal and does not state a buying or selling price.
Visual Beauty
Brightness, personality, color balance and movement must be judged from the diamond itself.
Legal Ownership
The report does not establish title, chain of ownership or the seller’s authority to transfer the diamond.
Future Performance
It cannot guarantee appreciation, liquidity, demand or the price achievable in a future sale.
Jewelry Craftsmanship
A loose diamond report does not evaluate the quality, security or design of a later setting.
Current Condition Forever
The findings describe the stone at examination. Damage, polishing or treatment performed later may change it.
The LAREINE protocol
Report First, Diamond Always
Every important natural fancy color diamond should pass both scientific verification and expert visual assessment.
Require explicit natural diamond identification.
Require a natural color origin conclusion.
Verify the report through the official database.
Match the report to the physical diamond.
Read modifiers and distribution in full.
Examine clarity features for durability.
Compare color under consistent lighting.
Judge beauty beyond the laboratory fields.
The LAREINE Perspective
A respected report protects the identity of a rare diamond, but it does not replace discernment. Science establishes what the diamond is. Expertise reveals why it is exceptional.
At LAREINE, documentation and visual character are considered together, because an important natural color deserves both certainty and beauty.
LAREINE