Lab-Grown Diamond Certification
Lab-Grown Diamond Certification: Understanding the Laboratories
Lab-grown diamonds are evaluated using the same 4Cs grading system—cut, color, clarity, and carat weight—as natural diamonds. However, not all gemological laboratories apply the same standards, nor are they equally recognized in the market. Some laboratories have gained stronger reputations for their rigorous grading processes, while others are more commonly used in the retail space.
One of the most renowned names in diamond certification is the Gemological Institute of America (GIA). Originally hesitant to certify lab-grown diamonds, GIA has now established a stringent grading process, applying the same high standards used for natural diamonds. Their certification reports explicitly state "Laboratory-Grown Diamond" and include details about the growth method, whether High-Pressure High-Temperature (HPHT) or Chemical Vapor Deposition (CVD). GIA-certified lab diamonds come with laser inscriptions for identification, ensuring authenticity.
However, the International Gemological Institute (IGI) is the most widely used laboratory for lab-grown diamonds. IGI dominates the commercial retail market, as it certifies the majority of lab-grown diamonds sold by major brands and online retailers. Unlike GIA, which only started grading lab-grown diamonds relatively recently, IGI was among the first laboratories to recognize and certify lab-created stones, making it the preferred choice for manufacturers and retailers. Additionally, IGI certifies both loose diamonds and finished jewelry, a key advantage over GIA, which focuses primarily on loose stones.
How to check if the diamond matches the Certificate?
Both GIA (Gemological Institute of America) and IGI (International Gemological Institute) provide laser inscriptions on diamonds, offering a unique identification feature that enhances traceability and authenticity. GIA inscriptions typically include the report number, allowing buyers to match the diamond to its official grading certificate, ensuring transparency and resale confidence. IGI also provides laser inscriptions, often featuring the certification number along with optional branding or lab-grown diamond indicators. These microscopic markings, located on the girdle of the diamond, do not affect its brilliance but serve as a permanent identifier, making verification easy for investors, retailers, and buyers.
In addition to GIA and IGI, other laboratories such as HRD Antwerp, GCAL (Gem Certification & Assurance Lab), and the American Gem Society (AGS) also offer lab-grown diamond certifications. HRD Antwerp is more common in European markets, while GCAL is gaining popularity in the U.S. retail sector for its cut grading and light performance analysis. AGS, though well-known for natural diamonds, is less dominant in the lab-grown diamond space.
