Artificially Induced Color in Amethyst-Citrine Quartz
A new and rather unusual gem material and possible treatments are discussed.
The Hidden Beauty of Amber: New Light on an Old Subject
The surprising inner world of inorganic inclusions in amber is explored through the use of polarized light and microscopic techniques.
Polymer-Filled Aquamarine
The authors have encountered hundreds of polymer-filled aquamarines in the Chinese jewelry market.
Demantoid Garnet Fossil Pseudomorphs
Need-Based Scholarships Offered by GIA Year-Round
GIA’s industry-leading and globally-recognized diploma and certificate programs educate professionals with the skills needed for success in the gem and jewelry industry.
蛍光性観察を使用したHPHT処理ダイヤモンドの分析
Evaluates a potential method of visually identifying HPHT-treated diamonds using microscopy to observe intense fluorescence at the facet edges and junctions.
Ruby and Pink Sapphire from Aappaluttoq, Greenland: Status of Ongoing Research
An exploration of the distinction between jadeite and omphacite, plus GIA's current policy concerning the definition of these stones.
EDUCATION
Whether you’re starting a new career or taking the next step in your professional journey, a GIA education is considered the pinnacle of training and professional development in gems and jewelry. We teach using the latest research, technology, and time-tested skills, while instilling the importance of professional integrity in our students. A true mark of global distinction, a GIA credential is a symbol of knowledge and trust.
Gemological Characteristics of Saltwater Cultured Pearls Produced After Xenotransplantation
Spectroscopic and radiographic study of experimental saltwater cultured pearls produced from xenotransplantation between P. margaritifera and P. maxima.
Faceting Transparent Rhodonite from Broken Hill, New South Wales, Australia
Transparent rhodonite is considered one of the most difficult of all gems to facet because of its perfect cleavage and brittle, uneven fracture.
“Fishbone” Inclusion in a Burmese Peridot from Mogok
Examination of Burmese peridot with impressive size, color, and clarity reveals a fishbone-shaped inclusion.
Ancient Script-Like Serpentine in Brown Peridot
Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.
Spray of Columbite Crystals in Topaz
A cluster of bladed columbite crystals is identified in colorless topaz.
Turquoise Planet Earth
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.
Two Pearls of Indian Cultural Significance
Two pearls representing Indian deities were recently examined in the Mumbai laboratory.
Identification of Natural, Reconstructed, and Imitation Root Amber
Three types of root amber beads submitted for identification are analyzed in Wuhan, China.
A “Cobalt Blue” Gahnospinel
Cobalt is identified as the primary coloring agent in an intense blue specimen of gahnospinel at GIA’s Bangkok laboratory.
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