Established in Antwerp in 1975, the International Gemological Institute (IGI) operates 29 laboratory locations worldwide, including major diamond hubs in Antwerp, New York, Mumbai, Surat, Hong Kong, and Dubai. When lab-grown diamonds emerged commercially, IGI pioneered dedicated, full-spectrum 4Cs certification for lab stones while other legacy institutions hesitated.
Today, IGI certifies more than 85% of all certified loose lab-grown diamonds in global wholesale commerce. An IGI report is an internationally recognized guarantee of authenticity, providing an impartial, third-party scientific audit of a diamond’s optical and physical credentials.
At the very top of the certificate, IGI clearly establishes the stone’s origin, baseline identity, and laboratory registration details. Below is an authentic representation of the official specimen (Report No. LG761568473):
In international diamond commerce, the physical certificate is delivered in an official IGI security trifold folio. The loose diamond specimen is inspected, weighed, and sealed alongside the report or mounted for delivery.
The "LG" prefix officially designates "Laboratory Grown" in the international IGI global database.
FTC-compliant mandatory declaration confirming 100% crystallized carbon created via technological synthesis.
Specifies the faceting architecture (57 facets) calibrated for maximum optical reflection.
Minimum diameter (6.83 mm), maximum diameter (6.86 mm), and total depth (4.22 mm) measured by non-contact 3D laser scanner.
The center-left block of the IGI certificate details the four fundamental gemological parameters (the 4Cs). Specimen LG761568473 achieves a virtually flawless grading tier:
Carat Weight Analysis: 1.23 Carats represents an optimal balance between visual presence (over 6.8 mm face-up spread) and pricing value, avoiding steep whole-carat retail price cliffs.
Color Grade D: The absolute highest colorless classification on the international diamond scale. Under standardized D65 daylight equivalent illumination, the diamond exhibits zero body tint or yellow nitrogen traces.
Clarity Grade VVS2: Very, Very Slightly Included. Inclusions in specimen LG761568473 are minute pinpoint crystals invisible to the naked eye and extremely difficult for a master gemologist to detect under 10× binocular magnification.
Cut Grade IDEAL: Reserved exclusively for Round Brilliant diamonds whose crown angle, pavilion angle, and table width align mathematically to maximize total internal light reflection.
On the right side of the certificate, IGI provides an exact cross-sectional proportions schematic alongside the optical finish grades. Every percentage on specimen LG761568473 falls strictly within the global Ideal Cut tolerance window:
Facets are polished to a flawless mirror smoothness with zero abrasive wheel lines.
All 57 facet junctions align precisely across opposite axes without rotational displacement.
Zero milky or hazy glow under 365 nm long-wave ultraviolet light.
Trust in diamond commerce relies on verifiable chain-of-custody. Learn the 4-step intake protocol used by master gemologists and luxury ateliers to cross-reference an IGI grading report against the physical diamond in hand.
Because cut lab-grown diamonds share identical physical, optical, and thermal properties with mined diamonds, gemologists use advanced spectroscopy and deep-UV fluorescence imaging to definitively identify growth origin and protect trade integrity.
The universal language of diamond quality is the 4Cs—Cut, Color, Clarity, and Carat Weight. Established by the GIA and adopted globally by IGI, the 4Cs apply with equal scientific rigor to lab-grown diamonds, governing both visual brilliance and wholesale commercial value.
Section 4: Growth Process Disclosure & Comments
The final section at the bottom of the IGI certificate contains critical technological and chemical declarations. Professional B2B buyers and diamond merchants inspect these exact statements on specimen LG761568473:
Photomicrograph Girdle Inscription
The certificate includes a dedicated photomicrograph reproducing the microscopic inscription etched onto the diamond's faceted girdle. This cold excimer UV laser inscription is non-destructive, permanent, and easily verified under a 10× or 20× jeweler loupe.
This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process.
Type II"
Confirms the diamond emerged from the synthesis apparatus in its pure D-color state with no post-growth laser or irradiation color treatment required.
Identifies that the diamond was crystallized inside an ultra-high pressure hydraulic press replicating Earth mantle physics (60,000 atm, 1,500°C).
The rarest chemical purity category (virtually zero nitrogen impurities). Type II diamonds represent under 2% of mined stones and produce exceptional optical transparency.