Connect with us

Press Releases

Analytical Gemology and Jewelry Head Says GIA Is ‘Wrong’ to Grade Lab-Grown Diamonds the Same as Mined

Read his full comment.

mm

Published

on

(PRESS RELEASE) AG&J Analytical Gemology and Jewelry head Dusan Simic has launched a response to the decision of the GIA to grade laboratory-grown diamonds in what he calls a standardized fashion.

“It is also unfortunate that the GIA only made its decision regarding LGDs after the recent publication of the third edition of Laboratory Grown Diamonds Information guide to HPHT and CVD grown diamonds, by myself and Branko Deljanin,” Dusan commented.

“One of the main doubts and discussions that Branko and I had while writing the third edition of our book was precisely how LGD s would be graded in the future he commented. While Branko’s commitment is to grade them like natural diamonds, which he does in his laboratory, I believe that grading should be different because natural diamonds and LGD are different products.”

“We waited for the GIA to decide and unfortunately, they made a decision and published it when our book was already printed. This means that we were not able to comment on it in our book and to present facts in support of our two views. AGJ believes that the GIA s decision is wrong. It is generally known that the color of CVD grown LGD s is unstable and changes even at relatively low temperatures in jewelry production or repolishing. Indeed, we discussed this very problem with participants at a globally attended webinar with CVD engineer Malay Hirani, co-author of LGD book on October 15 during the launch of our new book.”

“Our new research also shows the presence of iron in the surface of polished LGDs. Undoubtedly this is due to polishing under increased diamond pressure on the polishing wheel. The structure of the unformed crystal, with many columns that are perpendicular to the table, allows iron doping as well as oil from polishing paste to be absorbed. For now, we do not know how iron will behave over time and how it will affect the color and clarity of the LGD,” he concluded.

For further AG&J comments on the GIA s decision to grade LGD’s with the same terminology or regarding purchase of Laboratory Grown Diamonds Information guide to HPHT and CVD grown diamonds contact Dusan Simic at [email protected]

Advertisement

Simic and Deljanin will hold six more webinars from Oct 30 to December 18 with authors and co-authors. For more info, go here.

Continue Reading
Advertisement

SPONSORED VIDEO

Wilkerson Testimonials

Retirement Made Easy with Wilkerson

The store was a landmark in Topeka, Kansas, but after 80 years in business, it was time for Briman’s Leading Jewelers to close up shop. Third generation jeweler and owner Rob Briman says the decision wasn’t easy, but the sale that followed was — all thanks to Wilkerson. Briman had decided a year prior to the summer 2020 sale that he wanted to retire. With a pandemic in full force, he had plenty of questions and concerns. “We had no real way to know if we were going to be successful or have a failure on our hands,” says Briman. “We didn’t know what to expect.” But with Wilkerson in charge, the experience was “fantastic” and now there’s plenty of time for relaxing and enjoying a more secure retirement. “I would recommend Wilkerson to any retailer considering a going-out-of-business sale,” says Briman. “They’ll help you reach your financial goal. Our experience was a tremendous success.”

Promoted Headlines

Most Popular