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04:06 CH - Thứ Năm | 24/07/2025

What Is a GRA Certification Report? How to Read It & In-Depth Analysis

Key Takeaways

  • At Jemmia, we always encourage customers to clearly understand the importance of GRA certification in order to make smart and safe purchasing decisions. In this article, Jemmia will provide you with all...

At Jemmia, we always encourage customers to clearly understand the importance of GRA certification in order to make smart and safe purchasing decisions. In this article, Jemmia will provide you with all the necessary information about the GRA certificate, helping you easily check and verify the quality of this gemstone through this certificate. 

What is a GRA certificate?

The GRA certificate provided by the Gemological Research of America (GRA) is a certification document that assesses the quality and authenticity of gemstones, especially Moissanite stones and other synthetic gemstones. 

GRA was established in 2001 and has become a reputable standard in the gemstone industry. This certificate provides detailed information about the gemstone such as weight, color, clarity, cut, and other parameters related to the quality of the stone. 

Each gemstone certified by GRA has a code engraved on the girdle, making it easy for buyers to verify the product information.

Giấy kiểm định GRA là gì

 

What is the GRA certificate used for?

The GRA certificate plays an important role in the process of buying, selling, and authenticating gemstones. It helps consumers feel assured about the origin and quality of the product, avoiding the purchase of fake or low-quality gemstones. 

The GRA certificate provides full information about the stone, helping buyers easily compare and verify it with the information provided on GRA’s official website. This ensures transparency in transactions and increases the ability to resell the product when needed.

GRA grading criteria

Like GIA, the GRA organization also applies an international standard system to assess the quality of diamonds or moissanite. These criteria not only help determine the value of the stone but also serve as a basis for buyers to distinguish genuine from fake and choose the right product. Below is a summary table of common GRA grading criteria:

Criteria
Assessment content
Carat (Weight)
Measures the stone’s weight. 1 carat = 0.2 gram. The greater the weight, the higher the value.
Color (Color)
Color scale from D (colorless, highest) to Z (yellowish). The closer the color is to D, the rarer and more expensive it is.
Clarity (Clarity)
Evaluates internal inclusions and external blemishes. Grades: FL, IF, VVS1–2, VS1–2, SI1–2, I1–3. VVS1 is almost inclusion-free.
Cut (Cut)
Evaluates the perfection of the cut, directly affecting the stone’s brilliance and beauty. Grades: Excellent, Very Good, Good, Fair, Poor.
Proportions (Geometric proportions)
Includes depth (%), table (%), crown angle, pavilion angle, girdle, and culet. Standard proportions help the stone reflect light optimally.
Polish (Polish)
Evaluates the smoothness and finish of the stone’s surface. Good polish helps the stone look bright and free of tiny scratches.
Symmetry (Symmetry)
Checks the balance between facets. Good symmetry helps light disperse evenly, making the stone brighter.
Fluorescence (Fluorescence)
Measures the ability to glow under UV light. Levels: None, Faint, Medium, Strong. Strong fluorescence may make the stone appear cloudy or change color under natural light.

Detailed guide to reading a GRA certificate 

When receiving a GRA certificate, buyers will see many important parameters used to evaluate the gemstone. Below is how to read the basic information on the certificate:

ParameterDetailed parameterMeaningExample
GRADING REPORT GRA Report NumberAuthentication code2018021501
Cutting Style and ShapeCutting style and shapeRound Brilliant
MeasurementsSpecific dimensions 8 mm
GRADING RESULTSCarat WeightCarat weight2 carat 
Color GradeColor grade
Clarity GradeClarity assessment VVS1 
Cut Grade Cut qualityExcellent 
 ADDITIONAL GRADING INFORMATIONPolishPolish levelExcellent
Symmetry Symmetry Excellent
FluorescenceFluorescenceNone
InscriptionLaser inscription code on the stoneGRA 2018021501
NotesDiamond weight is same like Real weight - 2 Carat (The weight of a real diamond of the same size is equivalent to 1.8 carats)  
PROPORTIONSCut proportions  
CLARITY CHARACTERISTICSClarity characteristics 

Chi tiết cách đọc giấy kiểm định GRAHow to read a GRA certificate in detail 

How to check a GRA code

To verify the GRA code of a gemstone, you just need to follow these steps:

  • Visit the website http://www.gra-test.com/.
  • Enter the code engraved on the girdle of the gemstone into the “CODE” section.
  • Click search. If the gemstone has been authenticated by GRA, the related information will be displayed. Otherwise, if there is no information, that stone may not be a genuine product.

Which organization can provide a GRA certificate?

The GRA certificate is issued by the Gemological Research of America, an internationally reputable organization in the certification of lab-grown diamonds. 

In addition, other organizations such as GIA (Gemological Institute of America) and AGS (American Gem Society) are also famous for diamond certificates. In Vietnam, some domestic organizations such as SJC, PNJ, and GIV also provide certificates, but their credibility is not as high as that of international organizations.

See more: What are blood diamonds? The truth no one has revealed about blood diamonds

How much does GRA certification cost?

The cost of diamond grading and issuing a GRA certificate ranges from 60,000 to 120 million VND, depending on the size of the stone. The larger the diamond, the higher the grading cost due to the complex grading process and high accuracy requirements.

Distinguishing between GRA and GIA certificates 

GRA and GIA certificates are both certifications for assessing gemstone quality, but they differ clearly in grading subjects, credibility, and application. Specifically:
 

Criteria

GIA certificate

GRA certificate

Full name

Gemological Institute of America

Gemological Research of America

Grading subject

Natural diamonds, genuine gemstones

Mainly Moissanite and synthetic gemstones

Credibility

Highest in the world, globally recognized

Less popular, not widely recognized

Evaluation standard

Strictly based on the 4Cs and scientific criteria

Based on simpler criteria

Common application

Diamond trading, auctions, international investment

Used to confirm Moissanite in retail transactions

Grading cost

High

Low

How long does it take to get a GRA certificate?

The grading time to issue a GRA certificate usually takes about 48 hours in the Vietnamese market. However, this time may be longer for larger diamonds or Moissanite stones, or if more detailed examination of the stone’s characteristics is required.

Giấy kiểm định kim cương GRA

The grading time to issue a GRA certificate usually takes about 48 hours in the Vietnamese market

If there is no GRA certificate, is there any problem with the diamond?

Buying a gemstone without a GRA certificate can lead to significant risks regarding the product’s quality and value. Without a certificate, buyers may find it difficult to verify the origin and accurate information of the stone, increasing the chance of purchasing fake or low-quality goods. This is especially important for high-end diamond jewelry, because transparency and quality assurance are key factors in affirming the value of the jewelry piece.

Therefore, when buying gemstones, consumers should request a GRA certificate or other reputable certificates to protect their interests.

A GRA gemstone certificate is a key factor in confirming the quality and value of each gemstone. Understanding this certification not only helps you feel more confident when choosing a product but also protects you from risks related to fake or low-quality goods. Fully understanding the information on a GRA certificate will give you peace of mind and ensure that every decision to invest in gemstones is accurate, transparent, and worthy of the value you spend. Follow Jemmia to learn more about diamond knowledge. 

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Nhung Hoang

Author: Nhung Hoang

Content Writer Specialist

Nhung Hoang là Content Writer Specialist với hơn 3 năm kinh nghiệm nghiên cứu và phát triển nội dung về kim cương tự nhiên và ngành trang sức. Với nền tảng kiến thức được đào tạo trực tiếp bởi Giám đốc hoạch định GIA của Jemmia Diamond, Nhung Hoang tập trung xây dựng các bài viết chuyên sâu về kim cương GIA, trang sức kim cương và xu hướng trang sức, nhằm mang đến những thông tin chính xác và đáng tin cậy cho người đọc.

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