Independently Certified

Learn about our trusted certification labs and their processes.

Every diamond, whether it’s lab-grown or mined, goes through the exact same certification process to ensure you’re getting exactly what you pay for. While there are several different independent, internationally recognized laboratories who issue certifications, the evaluation process across them is uniform and objective.  Regardless of the lab, every diamond is graded individually by several gemologists. Scores are then compiled to determine the diamond’s final classification. Although every gemologist adheres to the same criteria and standards, it’s not unusual for a diamond to receive a variety of grades—even if it’s sent back to the same lab for a second grading.  These standards are referred to as the 4C’s — cut, clarity, color, and carat. Gemologists will evaluate how well the diamond was cut from its raw form, how internally and externally flawless it is, how clear it is and how much it weighs.  Once the diamond has been evaluated, the lab will compose a full report, detailing each quality and providing a visual “map” of the diamond. This map illustrates any inclusions or blemishes found inside and/or on the surface of the stone. This report also includes your diamond’s unique identification number. Every Great Heights center diamond has its identification number inscribed on its girdle. This microscopic laser inscription can only be seen under magnification and doesn’t impact the beauty of the diamond in any way. It’s our way of giving you additional peace of mind; you’ll rest assured knowing that the stone you purchase is the same one you’ll receive—and proudly display for a lifetime together. With over 100 years of combined experience, our founders have created a company designed with your best interests in mind. We pride ourselves on offering the highest quality lab-created diamonds available for a fraction of the cost of mined diamonds. With our expertise and selection, we’re here to help you find and customize your dream ring.

FAQs About Diamond Certification:

What certifications does Great Heights use?

International Gemological Institute
The International Gemological Institute (IGI) was first established in 1975 in Antwerp, Belgium. In a city known for its diamond trading and craftsmanship, IGI is the oldest operating laboratory. Over time, IGI has developed and been the first to introduce several innovative techniques and processes in diamond evaluation. To learn more about IGI’s impressive history and their significant contributions to the diamond industry, visit their site.

Other Labs We Use

Gem Certification and Assurance Lab

The Gem Certification and Assurance Lab (GCAL) was founded in New York City back in 2001. They’re known for their Guaranteed Diamond Certifications, which means they ensure their assigned cut, color and clarity grades—as well as carat weights of the diamonds—with a cash back policy. For more on GCAL and their exclusive certification guarantee, visit their site.

What is the best certification for diamonds?

Every lab uses approximately the same grading process to evaluate diamonds, but everyone has their own opinion which of these labs is the “best.” Great Heights uses IGI and GCAL diamond grading in conjunction with one another because both labs have excellent reputations and are known for their expertise.

What is a IGI diamond certification?

The International Gemological Institute (IGI) refers to another of the most esteemed labs for diamond evaluation. IGI has been a pioneer, contributing many of the most significant innovations in diamond evaluation and remains the largest organization of its kind. Along with GCAL, these two certification processes ensure that every Great Heights diamond is expertly evaluated and graded.

What is a GCAL diamond certification?

A GCAL diamond has been certified by the Gem Certification & Assurance Lab (GCAL). A GCAL certification gives you confidence and a guarantee that your diamond is accurately evaluated and graded in terms of cut, color, clarity, and weight.