At What Diamond Size Do You Get a Certificate, What Kind of Certification, and Where?
Key Takeaways
- Diamonds from 2.5mm to 3.0mm (ly) and above are the standard size for appraisal centers such as GIA, IGI, or PNJ to accept issuing grading certificates. This certification is the most important...
Diamonds from 2.5mm to 3.0mm (ly) and above are the standard size for appraisal centers such as GIA, IGI, or PNJ to accept issuing grading certificates. This certification is the most important legal proof for determining the true value of the stone based on the 4Cs, helping customers avoid buying counterfeit goods or items with inflated prices.
In this article, Jemmia experts will clarify the regulations on certification size and the differences between domestic and international certificates.
How many ly must a diamond be to have a grading certificate?
The minimum size for a diamond to be issued an independent grading certificate is usually from 2.5 ly (2.5mm) and above; for smaller stones (melee diamonds), they are usually graded by parcel. This regulation ensures the stone is large enough for experts to accurately examine characteristics such as clarity (Clarity), color grade (Color), and cut (Cut) as precisely as possible.
- Under 2.5 ly: Usually only identity certificates by blister pack or parcel from domestic units are available.
- From 3.0 ly and above: A separate grading certificate (GIA, IGI...) is required to ensure transfer value and global liquidity.
- Appraisal cost: Ranges from a few hundred thousand to tens of millions of VND depending on carat weight and the grading organization.
Figure 1: How many ly must a diamond be to have papers is a matter of concern to many people
See more: How to choose diamond earrings that match your outfit
How many types of diamond grading certificates are there?
The current market is divided into two main certificate groups: international grading certificates (GIA, IGI, HRD) with global value and domestic grading certificates (SJC, PNJ, GIV) with circulation value within the country. The choice of certificate type directly affects the reputation and selling price of that diamond in the market.
International grading certificates are valid internationally. They are issued by famous centers such as GIA, AGS, EGL, IGI, HRD. Meanwhile, domestic grading certificates are usually issued by industry experts such as SJC, PNJ, or GIV…. However, domestic certificates are only valid locally.
The types of grading certificates also create price differences for diamonds. This is mostly because international grading centers usually have higher costs. These grading certificates are also used worldwide, with higher accuracy than domestic experts.
The current market is divided into two main certificate groups
Is a diamond grading certificate important?
A grading certificate is the only "birth certificate" proving that the diamond is natural, unused, and helping accurately value your asset. Without this certificate, even the most experienced person would find it difficult to distinguish a real diamond from simulants such as Moissanite or lab-grown diamonds (LGD).
- Prevent commercial fraud: Prevents the substitution of lower-quality stones into expensive jewelry settings.
- Investment assurance: Makes buyback and exchange easier with the closest possible market value.
- Online verification: With GIA certificates, you can check the inscription number on the official website to verify the information 1:1.
Diamond papers are very important in diamond valuation
Currently, there are still many cases of fake grading certificates on the market. By taking the certificate of a high-quality diamond and pairing it with a lower-quality diamond in terms of color and cut. This is a method business owners use to easily deceive buyers and profit illegally.
Grading certificates cannot truly be lost because a copy of the certificate is kept at the grading authority. In case of loss, you are required to apply for reissuance. However, for certificates issued abroad, reissuance is very difficult and requires a high cost.
To avoid being taken advantage of by fraudsters, you should especially avoid buying floating diamonds without grading documents.
Jemmia - A trusted place to buy diamonds
Jemmia Diamond is a unit authorized by the Gemological Institute of America (GIA) to import and distribute authentic diamonds, committed to bringing transparent and sustainable investment value to customers. We not only provide the most brilliant diamonds but also establish strict standards for legality and business ethics.
- 100% official import: All diamonds at Jemmia come with full invoices, GIA documents, and customs records, ensuring absolute legal ownership rights.
- World-class 2% selection standard: Jemmia only selects stones of top quality according to the 4C standard, completely eliminating samples with defects affecting structure and durability.
- Pioneering modern technology: Using 100% grading equipment from GIA USA (GIA iD100, Diamond Dock...) to verify the origin of natural diamonds, giving customers absolute peace of mind.
- Ethical value and responsibility: Only imports from countries that comply with the "Kimberley Process," committed to not using diamonds from war zones or causing environmental harm.
- Optimal buyback and exchange policy: Price lists are always public and transparent, along with the best exchange policy on the market, protecting customer rights to the maximum when they want to invest or upgrade.
Jemmia - A trusted place to buy diamonds
In summary, diamonds from 2.5 ly to 3.0 ly and above are the standard size to be issued an independent grading certificate to guarantee value and transparency. Owning a diamond with an international certificate (GIA) not only helps customers feel assured about its true quality but also ensures optimal benefits when conducting buyback and exchange transactions.
