GIA’s 6thAnnual Jewelry Design Competition Highlights Emerging Talent
As a leading educational institute, GIA helps educate the next generation of gem and jewelry professionals in gemology, jewelry design and jewelry manufacturing arts.
GIA’s 6thAnnual Jewelry Design Competition Highlights Emerging Talent
As a leading educational institute, GIA helps educate the next generation of gem and jewelry professionals in gemology, jewelry design and jewelry manufacturing arts.
GIA Researchers Identify New Spinel Treatment
Scientists at the GIA laboratory in New York City recently discovered spinel treated by nickel diffusion in a parcel of gems acquired for research purposes by the GIA research team in Bangkok.
GIA Researchers Identify New Spinel Treatment
Scientists at the GIA laboratory in New York City recently discovered spinel treated by nickel diffusion in a parcel of gems acquired for research purposes by the GIA research team in Bangkok.
Color Modification of Spinel by Nickel (Ni) Diffusion: A New Treatment in the Gem Market
GIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.
A Partially Hollow Natural Blister Pearl Filled with Foreign Materials
A very large baroque white pearl is further examined in the Mumbai laboratory due to its suspicious heft.
Two Black Non-Nacreous Bead Cultured Pearls from Pinctada margaritifera
The Carlsbad laboratory identifies two non-nacreous bead cultured pearls from Pinctada margaritifera.
“Electromagnetic Wave” Inclusion in Mong Hsu Ruby
Fiber-optic illumination reveals an electromagnetic wave-like pattern of particles in a ruby from Myanmar.
An Extraordinarily Large Cat’s-Eye Emerald
The Tokyo laboratory examines a 126 ct cat’s-eye emerald from Brazil.
Extremely Rare Hellandite Inclusion Found in a Mogok Ruby
A rare inclusion is reported in ruby from the Mogok mine for the first time.
A Closer Look at Internal Etch Channels in Diamond
The Carlsbad laboratory reports on a Fancy Deep brownish yellowish orange diamond featuring trigons within subsurface etch channels.
Unusual “Horsetail” and Columnar Inclusions in Demantoid
Examination of a yellowish green demantoid reveals fibers of serpentine in a randomly curved pattern and a columnar two-phase negative crystal.
Four-Rayed Star Chrysoberyl
A unique combination of two intersecting cat’s-eyes is observed in chrysoberyl at the Tokyo laboratory.
Gems Formed in Magmatic Rocks
This installment of “Colored Stones Unearthed” covers gemstones that formed in magmatic environments and the insights they offer into the evolution of the earth and the geological processes that shaped our world.
Low-Temperature Heating of Mogok Ruby, Copper-Diffused Feldspar, Porcelain-Treated Turquoise, and the Work of Gem Artist Chi Huynh
An overview of the Winter 2022 Gems & Gemology content.
Never Stop Innovating: Gem Artist Chi Huynh
Profiles a groundbreaking gem artist on a quest to bring new concepts, techniques, and products to the industry.
A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby
Documents heating experiments conducted on Burmese rubies to find useful indicators of heat treatment at temperatures below 1200°C.
Composition and Spectral Characteristics of Porcelain-Treated Turquoise
Characterizes turquoise treated with an inorganic additive that dramatically improves the luster and color of low- and medium-quality material.
Fluorescence Characteristics of Two Copper-Diffused Plagioclase Feldspars: Labradorite and Andesine
Examines the use of strong fluorescence near 394 nm under 320 nm excitation as a potential means of identifying copper diffusion treatment of feldspar.
Calcite Found on the Surface of a Saltwater “Nacreous” Pearl
The Hong Kong laboratory reports on the unexpected discovery of calcite on the surface of a “nacreous-looking” pearl.