Natural Diamond Report
Laboratory Diamond Report
Diamond Optical Evaluation
GIL Diamond DNA Instrument

In terms of the traditional 4C grading of diamonds, GIL maintains the same strict and internationally recognized US standards as GIA. In addition to the traditional 4C, GIL creatively introduced the optical evaluation of diamonds in the process of continuous improvement of the grading system. To evaluate diamond cutting standards in a more comprehensive and systematic way from three projects, namely light return, optical symmetry and scintillation. With the traditional cut/polish/symmetry, the total is 6EX!! From the most professional and authoritative point of view, we will identify the best diamond for you.

Diamond Certificate

Laboratory Grown diamonds, also known as "synthetic diamonds", "synthetic diamonds" or "manufactured diamonds", are diamonds that have been created in a laboratory. Unlike natural diamonds, natural diamonds are formed inside the Earth and are a natural process.

The GIL Lab-Grown Diamond Certificate provides the same information as the GIL Diamond Certificate, but the color of the certificate is yellow. The waist of the synthetic diamond is laser engraved with the certificate number and the "lab grown" logo. These steps are designed to protect consumers' right to know. Only when the gemstone has a certificate of quality can it be safely traded. No matter in any corner of the world, an authoritative and reliable IGI laboratory certificate represents the trust and confidence shared by the entire gemological world.

Lab-grown Diamond Certificate

Light Return

Light return is also called luminance or total luminance. This is the special way that diamonds reflect and refract light, causing it to return to the observer's eye, which has made diamonds highly sought after for centuries.GIL's optical performance technology captures and measures the actual light output of a diamond. The Gemprint instrument shines a beam of light (a red laser) onto the diamond and analyzes the light emitted from the diamond. First, data is obtained by shooting the beam directly vertically into the diamond, and then the instrument aims the beam at the diamond while tilting it about 12-14 degrees in eight different directions to establish light reflection from different angles. The data is collated, analyzed, and graded into fair, good, very good, and excellent.


Critical Angle

For more than a hundred years, mathematicians and diamond cutters have understood the important role that the diamond critical angle plays in creating a bright, well-cut diamond. The critical angle (the pavilion angle) determines whether light entering through the crown (top) is reflected back through the crown or leaks out through the pavilion (bottom). As you can see from the shallow cut and deep cut diamond images, you can see the correlation between GIL's direct assessment of light return and the well-documented cutting criteria.

Optical Symmetry

Optical symmetry is the uniformity of light return. It is determined by the equality of each facet and Angle, the alignment of the crown and pavilion, and the orientation of the countertop and cusp base. Basically it is an assessment of the diamond cutter's craftsmanship, attention to detail and overall skill.An optically symmetrical image is the light return captured when the diamond is perpendicular to the beam. The equality of light return is calculated mathematically and analyzed on a fair, good, very good, and excellent scale. To facilitate the visualization of symmetry, the image is colored and divided into eight equal parts; The more uniform the pattern of each part, the better the optical symmetry.


Optical Scintillation

Scintillation is the flash of light seen when a diamond moves. Because the diamond is never viewed from just one angle, the instrument takes into account the overall light return of the diamond from different angles. GIL captures the light return of the diamond at nine different locations and reports the flashing part. The image on the right shows a diamond tilted in nine different positions.

Diamond Optical Evaluation

Capturing a diamond's unique optical fingerprint, measuring light return, optical symmetry and scintillation, photomicrography of the diamond and its internal features captures, photographs and records many other identification points.

The GIL T system provides users with the world's most advanced, non-invasive and court-approved method for gemstone identification. Users will soon be able to scan and store their GIL "fingerprints" as well as gems from their inventory. You will be able to provide a "Certificate of Registration" and upload the information to the International Gemstone Registry, which will be permanently stored for future identification, verification and recovery. Taking into account the issue of updating gemstones, the system will enable you to keep a list of items received by your customers and assure them with certainty that what you return will be the same gemstone that was originally offered to you. With an international gem registry at your fingertips, you'll be able to receive advice from law enforcement, insurance companies and legal professionals to help identify lost or stolen gems. The GILT system will help you quickly identify diamond imitations at the repair counter, as they have different refraction properties. Unlike laser engraving, GIL's "fingerprints" cannot be removed and all registered gemstones are stored in a single international database. GEMPRINT is the most valuable service you can offer your customers, offering them confidence, peace of mind and insurance discounts from more than 30 international companies. In addition, consumer demand for protection means that GEMPRINT systems will be a big source of revenue for your company in the coming years.

Diamond DNA

Gem International Laboratories