Jewelry Certification & Valuation

Understanding the IGI Diamond Clarity Report

When purchasing a diamond, understanding its quality is paramount. The International Gemological Institute (IGI) is a well-respected organization that provides detailed reports on diamonds, including a thorough assessment of their clarity. An IGI Diamond Clarity Report is a crucial document that outlines the presence and nature of internal and external characteristics, known as inclusions and blemishes, respectively. This report helps consumers make informed decisions by providing an objective evaluation of a diamond’s pristine nature.

Definition

An IGI Diamond Clarity Report is an official document issued by the International Gemological Institute that details the clarity grade of a polished diamond. Clarity refers to the absence of internal flaws (inclusions) and external imperfections (blemishes). The report includes a detailed description of these characteristics, their location, and size, all contributing to the diamond’s overall clarity grade, which typically ranges from Flawless (FL) to Included (I3).

Key Features

An IGI Clarity Report is comprehensive and includes several key features:

Diamond Identification: Basic information such as carat weight, cut, color, and measurements.
Clarity Grade: The primary assessment of the diamond’s clarity, based on the GIA clarity grading scale.
Plot Diagram: A visual representation of the diamond, showing the exact location and nature of inclusions and blemishes. This is a critical feature for identifying a specific diamond.
Inclusion/Blemish Descriptions: A written list detailing each significant internal and external characteristic, including its type, size, and location (e.g., feather on the table facet, crystal near the girdle).
Magnification: The report is based on examination under 10x magnification by a trained grader.
Grading Scale: The report adheres to internationally recognized clarity grading standards.

Origin and History

The International Gemological Institute (IGI) was founded in Antwerp, Belgium, in 1975. It was established to provide independent and reliable diamond grading services in a major diamond trading hub. Over the years, IGI has expanded its reach globally, opening grading and training centers in key cities worldwide. The concept of diamond grading, including clarity, has evolved over decades, with standardized scales developed to ensure consistency and trust in the diamond trade. The IGI report is a modern manifestation of this need for standardization and expert evaluation.

Grading & Quality Standards

IGI uses a standardized clarity grading system, largely based on the universally accepted scale developed by the Gemological Institute of America (GIA). The scale categorizes diamonds based on the visibility of inclusions and blemishes under 10x magnification:

FL (Flawless): No inclusions or blemishes visible under 10x magnification. Extremely rare.
IF (Internally Flawless): No inclusions visible under 10x magnification, but may have minor blemishes.
VVS1, VVS2 (Very, Very Slightly Included): Inclusions are extremely minor and difficult to see under 10x magnification, even for a trained grader.
VS1, VS2 (Very Slightly Included): Inclusions are minor and difficult to see under 10x magnification.
SI1, SI2 (Slightly Included): Inclusions are noticeable under 10x magnification but may be invisible to the unaided eye.
I1, I2, I3 (Included): Inclusions are obvious under 10x magnification and may affect transparency and brilliance, and are often visible to the naked eye.

The IGI report meticulously documents the specific inclusions and blemishes that determine the assigned grade.

Buying Guide

When you encounter an IGI Diamond Clarity Report, consider these points:

Examine the Plot: The plot diagram is your visual guide. Compare it to the actual diamond, if possible. Look for the types and locations of inclusions and blemishes listed.
Understand the Grade: Familiarize yourself with the clarity grading scale. A VVS diamond is significantly different in rarity and price from an SI diamond.
Eye-Cleanliness: For most consumers, the most important factor is whether the diamond appears clean to the naked eye. An SI diamond can often be eye-clean, offering good value.
Inclusion Type: Some inclusions are more detrimental to a diamond's beauty and durability than others. Feathers can sometimes pose a risk of chipping, while crystals are often less impactful if small and well-placed.
Report Authenticity: Ensure the report number matches any inscription on the diamond's girdle.
Compare Reports: If possible, compare reports from different reputable labs for the same diamond, though IGI reports are widely accepted.

Price Range & Value Factors

Clarity is a major factor influencing a diamond’s price. Generally:

Higher Clarity Grades (FL, IF, VVS) command significantly higher prices due to their rarity. These diamonds have fewer and less noticeable internal flaws.
Mid-range grades (VS, SI) offer a balance between appearance and cost. Many diamonds in this range appear eye-clean and provide excellent value for their beauty.
Lower grades (I) are the most affordable but may have visible inclusions that can affect brilliance and durability.

Beyond the clarity grade itself, the type, size, number, and location of inclusions also impact value. A single, small, white inclusion might have less impact than numerous dark, large inclusions, even if both diamonds fall into the same general grade category.

Care and Maintenance

While the IGI Clarity Report focuses on inherent characteristics, proper care ensures a diamond maintains its beauty. Regular cleaning with a soft brush, mild dish soap, and warm water can remove oils and dirt that dull its sparkle. Avoid exposing diamonds to harsh chemicals or extreme temperature changes. For diamonds with lower clarity grades, particularly those with significant feathers, exercise caution to avoid chipping or fracturing.

Pros and Cons

Pros:

Objectivity: Provides an independent, expert assessment of diamond clarity.
Consumer Confidence: Helps buyers understand exactly what they are purchasing, reducing the risk of overpaying.
Standardization: Adheres to established grading scales for consistency.
Identification: The plot diagram aids in verifying the specific diamond.
Resale Value: A report from a reputable lab like IGI can support a diamond’s resale value.

Cons:

Cost: Obtaining a grading report involves fees.
Subjectivity Nuances: While standardized, there can still be slight variations in grading between individual gemologists or even labs.
Focus on Flaws: The report details imperfections, which might be a concern for some buyers, even if invisible to the naked eye.

Common Misconceptions

All inclusions are bad: Natural diamonds inherently contain inclusions; they are proof of origin and can even add character. The degree to which they impact beauty and value is key.
A diamond must be Flawless to be beautiful: Many diamonds graded SI or even I can appear eye-clean and be stunningly beautiful. Clarity is just one of the 4Cs.
IGI reports are the same as GIA reports: While both use similar scales, grading can sometimes differ slightly between labs. IGI is widely respected, but GIA is often considered the industry benchmark.
A low clarity grade means a bad diamond: This is not always true. A well-cut diamond with a lower clarity grade can still possess excellent sparkle and brilliance, and represent good value.

Related Terms

Diamond Clarity: The measure of a diamond’s internal and external imperfections.
Inclusions: Internal characteristics within a diamond.
Blemishes: External characteristics on the surface of a diamond.
Plot Diagram: A map showing the location and type of inclusions and blemishes.
GIA: Gemological Institute of America, another major diamond grading laboratory.
4Cs: The standard characteristics used to grade diamonds: Carat, Cut, Color, and Clarity.
Loupe: A magnifying glass used by jewelers to examine diamonds.

FAQs

What is the most important part of an IGI Clarity Report?

The plot diagram and the detailed description of inclusions/blemishes are crucial for understanding the specifics of a diamond’s clarity and for verifying the diamond itself.

Can a diamond with inclusions be beautiful?

Yes, absolutely. Many diamonds with inclusions, especially those graded VS or SI, can appear eye-clean and exhibit excellent sparkle and beauty. The impact of inclusions depends on their type, size, number, and location.

Is an IGI report as good as a GIA report?

Both IGI and GIA are highly reputable laboratories. IGI reports are widely accepted and trusted. GIA is often considered the industry standard and may have slightly stricter grading, but an IGI report is a valuable indicator of a diamond’s quality.

What does eye-clean mean?

Eye-clean means that no inclusions or blemishes are visible to the unaided eye when the diamond is viewed face-up under normal lighting conditions.

Should I always buy a diamond with an IGI report?

While an IGI report provides valuable assurance, it’s also important to consider the retailer, the diamond’s cut, color, and carat weight, and your personal preferences and budget.