Nathan Renfro, Manager of Colored Stone Identification

[cid:image001.jpg@01D78842.54E87AE0] Hear from GIA researchers on the latest topics: Highlights from Gems & Gemology: Spring 2021 Issue Thursday, August 5 at 10:00 a.m. PDT Curious about what’s inside the latest edition of Gems & Gemology (Spring 2021, volume 57, issue 1<https://www.gia.edu/gems-gemology>)? Tune in to hear about the contents of GIA’s prestigious research publication. Contents: * Internal Structures of Known Pinctada maxima Pearls: Natural Pearls from Wild Mollusks * Technical Evolution and Identification of Resin-Filled Turquoise * How to Calculate Color from Spectra of Uniaxial Gemstones * Micro-Features of Spinel * Lab Notes: Asterism in natural diamond cabochons • Bicolor rough diamond crystals • Rare faceted hexagonite • Prominent growth planes in HPHT-processed CVD-grown diamonds • Cat’s-eye opal • Green opal displaying aventurescence • Natural fossil pearls and shell blister from the Florida coast • Lead glass–filled laboratory-grown ruby [Text Description automatically generated] Speakers: Dr. Chunhui Zhou, Senior Manager of Pearl Identification Nathan Renfro, Manager of Colored Stone Identification Introductions: Stuart Overlin, Managing Editor of Gems & Gemology [cid:image003.png@01D78842.54E87AE0][Graphical user interface, Teams Description automatically generated] Nathan Renfro earned his Graduate Gemologist diploma from GIA Carlsbad, where he now works as the Manager of Identification (Colored Stones). His main areas of interest are inclusion identification, photomicrography, lapidary arts and defect chemistry of corundum. Dr. Chunhui Zhou is the senior manager of pearl identification at GIA New York. His main area of interest is the identification and research of pearls and related materials. Stuart Overlin is managing editor of Gems & Gemology and joined the journal in 1997. He is a graduate of the U.S. Naval Academy and has a master’s in writing and publishing from DePaul University. ===================== Register https://discover.gia.edu/webinar-gems-gemology-highlights-spring-2021-issue.html Recorded past GIA Knowledge Sessions<https://www.gia.edu/knowledge-sessions-webinar> =====================