December 2021 | Lab Grown Magazine

December 2021 | The Lab Grown Diamond Resource Book 34 To advertise call (888) 832-1109 | December 2021 35 DIAMONDS – NATURAL TREATED & LABORATORY GROWN Reviewed by Cynthia Unninayar W hen award-winning gemologist, Branko Deljanin, president of Vancouver-based CGL Canadian Gemlab, comes out with a new book, people take notice. This is certainly the case with his latest, which features chapters by some of the world’s most accomplished gemologists, researchers, and academics in the diamond and gem world. “The idea for this book came from the realization that, while there are many publications on the history and grading of diamonds and diamond jewelry, there is no book with deeper in-depth information, including defects, causes of color, and identification of natural, treated, or laboratory-grown diamonds,” explains Deljanin. The diamond world has dramatically changed over the last few decades. A completely new market has developed for lab-grown stones, which are now being produced in large quantities at relatively low cost. We are already seeing some of their effects on the mined diamond market, although it is perhaps too early to determine the extent to which the two sectors will compete. But as LGDs find their own place in the market, the need becomes greater for transparency and disclosure, in order to ensure that customers clearly understand and can have confidence in the stones they purchase. Clearly, gem labs have their role to play in this discussion, but it is useful for anyone dealing with diamonds to have a solid background in these sparkling gems. The book is divided into three sections: Background on diamond defects and spectroscopy; Production of lab-grown and treated diamonds; and Instrumention for testing and identification of diamonds. Each co-author has a specialized chapter in the section 1 DIAMONDS NATURAL, TREATED & LABORATORY-GROWN ADVANCED EDUCATIONAL SERIES BRANKO DELJANIN Dr. Alan Collins Dr. Alexander Zaitsev Dr. Taijin Lu Dr. Viktor Vins John Chapman Dr. Thomas Hainschwang Title: DIAMONDS – NATURAL,TREATED & LABORATORY GROWN Author: Branko Deljanin, with co-authors Alan Collins, Alexander Zaitsev, Taijin Lu, Victor Vins, John Chapman, &Thomas Hainschwang Publisher: Gemmological Research Industries, Inc, Canada, 2021; 184 pages; Available at brankogems.com ISBN: 978-1-7773692-2-4 (Hardcover) ISBN: 978-1-7773692-3-1 (Softcover) Example of a page from the book: Page 112, (in Chapter 5, by Deljanin, entitled ‘Comparison of Portable Instruments for Screening and ID of Natural and Laboratory-Grown Diamonds’) It shows the fluorescence and cross-polarized filter images of three types of diamonds (natural, HPHT, CVD) using a Synthetic Diamond Kit. relating to the subject. In Chapter 5,Deljanin offers a detailed look at a variety of instruments used by gem laboratories, retailers, and appraisers. He continues this examination in a very comprehensive Appendix that shows the results of samples of diamonds, LDGs, and imitations tested on 11 different instruments. Although the book is highly technical, it is still comprehensible to the average reader who has an interest in learning about diamonds of all kinds and their various treatments. For people in the trade, it is a must-have for any diamond library, with its clear explanations of the technologies used to differentiate natural from lab-grown and treated diamonds. ◊