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https://www.gia.edu/gems-gemology/winter-2015-characterization-tarnish-spots-chinese-high-purity-gold-jewelry Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry | Gems & Gemology Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided. chinese highgold jewelrygems gemologycharacterizationtarnish https://www.gia.edu/gems-gemology-fall-2024 Fall 2024 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America gemological institute americafall 2024gems gemologyquarterly journal https://www.gia.edu/gems-gemology-publication-info-winter-2025 Winter 2025 G&G Publication Information | Gems & Gemology winter 2025publication informationgems gemology https://www.gia.edu/gems-gemology Winter 2025 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America gemological institute americawinter 2025gems gemologyquarterly journal https://store.gia.edu/collections/gems-gemology Gems & Gemology – GIA Store gems gemologygia store https://www.gia.edu/gems-gemology-fall-2025 Fall 2025 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America gemological institute americafall 2025gems gemologyquarterly journal https://www.gia.edu/gems-gemology-spring-2019 Spring 2019 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America gemological institute americaspring 2019gems gemologyquarterly journal https://www.gia.edu/gems-gemology/summer-2018-natural-color-blue-gray-violet-diamonds Natural-Color Blue, Gray, and Violet Diamonds: Allure of the Deep | Gems & Gemology Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce... natural colorblue graygems gemologyvioletdiamonds https://www.gia.edu/gems-gemology/winter-2018-natural-color-pink-purple-red-brown-diamonds Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors | Gems & Gemology Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties. natural colorpink purplemany colorsgems gemologyred https://www.gia.edu/gems-gemology/spring-2017-gemnews-new-discovery-emeralds-ethiopia A New Discovery of Emeralds from Ethiopia | Gems & Gemology A report on a new Ethiopian source of high-quality emerald. new discoverygems gemologyemeraldsethiopia https://www.gia.edu/gems-gemology-fall-2021 Fall 2021 Gems & Gemology | The Quarterly Journal of the Gemological Institute of America gemological institute americafall 2021gems gemologyquarterly journal https://www.gemdat.org/ Gemstone Database - Gems and gemology, Gem Localities, Photos and Data The web's most comprehensive and regularly updated gemogy database with information on gems from around the world and thousands of photos photos datagemstonedatabasegemologylocalities