Large Type IIa Diamond from Arkansas, USA
The GIA lab in Carlsbad recently had the opportunity to examine a truly “all-American” diamond.
Largest CVD Laboratory-Grown Diamond Submitted to GIA (英语)
Progress in creating laboratory-grown CVD diamonds allows for larger sizes, including the largest yet seen at the Carlsbad lab.
Mineral Inclusions in Sapphire from Basaltic Terranes in Southern Vietnam: Indicator of Formation Model
Proposes a formation model for sapphire from the main deposits in southern Vietnam based on the chemical composition of their mineral inclusions.
Fluorescence Characteristics of Blue Amber from the Dominican Republic, Mexico, and Myanmar
Presents a combination of observational and spectroscopic means to separate the three main geographic localities for blue amber, which shows very strong blue fluorescence under sunlight or D65 illumination.
Low-Temperature Heat Treatment of Pink Sapphires from Ilakaka, Madagascar
Studies the effects of low-temperature heat treatment on inclusions in this gem material, as well as the use of FTIR spectroscopy to detect the treatment.
What Have Diamond Ages Taught Us?
Diamond ages offer insight into continent evolution spanning billions of years.
New Emerald Locality in Southern California
Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District.
Rhodium-Plated Iron Meteorites
The annual Tucson Gem and Mineral Show has been a reliable source for the niche and the unusual, as seen with the rhodium-plated iron meteorites acquired by author BL at the 22nd Street Show in February 2020.
Snowflake Inclusions in Mong Hsu Ruby
A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.
Artificial Glass Imitating a Paraíba Tourmaline
A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.
Uncommon Inclusion of Lazurite in Ruby from Mogok, Myanmar
A parcel of small rubies was received for identification at the S Gemmological Institute (SGI) gem lab in Yangon, Myanmar.
Pink Sapphires from Madagascar, Rose-Cut Colored Stones from the Baroque Era, Separating Blue Amber Localities, and More…
An overview of the Winter 2020 Gems & Gemology content.
A Study on Improving the Surface Appearance of Low-Quality Pinctada maxima Bead Cultured Pearl
GIA Counters Counterfeit Inscriptions
CARLSBAD, Calif. – Feb. 23, 2021 – Recently, GIA (Gemological Institute of America) encountered a number of stones that were submitted for updated reports or verification services that did not match the GIA report submitted with them. The newly-submitted stones were either laboratory-grown diamonds or treated natural diamonds, falsely inscribed with GIA report numbers.
US$2 Million Available in 2021 GIA Scholarships
CARLSBAD, Calif. – Feb. 3, 2021 – Whether you are new to the gem and jewelry industry or a veteran looking to expand your knowledge, education from GIA will equip you with the tools to succeed. A scholarship from GIA makes achieving your educational goals financially attainable.
Colorless to Near-Colorless Diamonds, Emeralds from Pakistan, a History of European Royal Jewel Sales, and More…
An overview of the Fall 2020 Gems & Gemology content.
Quarterly Crystal: Ferrocolumbite in Topaz
“Star cruisers” formed of ferrocolumbite seem to fly in a large topaz crystal from the Shigar Valley in Pakistan.
Unknown Dendritic Inclusions in Sapphire
Dendritic inclusions in a pinkish-purple sapphire are revealed with fiber-optic lighting.
Unique Raindrop Pattern of Turquoise from Hubei, China
Presents spectroscopic and chemical analysis of a new variety of turquoise with a rare raindrop pattern with saturated colors.
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