Somewhere in the Rainbow Finds a Home at the Alfie Norville Gem and Mineral Museum
A beautiful new gem and mineral museum in Tucson is home to the stunning Somewhere in the Rainbow collection.
Rare Faceted Hexagonite
The Carlsbad laboratory recently examined an unusually large faceted hexagonite with iridescent cleavage cracks and needle-like structures.
Virtual Report on the Industry in 2021
An overview of how the gem and jewelry trade, from miners to manufacturers, and from designers to dealers, dealt with the many challenges posed by the pandemic.
Fourth Annual Gianmaria Buccellati Foundation Award
A graduate of GIA’s Hong Kong Jewelry Design program hopes her award-winning design will help raise environmental awareness.
Asterism in Natural Diamond Cabochons
Two cabochons displaying white four-rayed “stars” are fashioned from one large natural diamond crystal.
Technical Evolution and Identification of Resin-Filled Turquoise
Provides criteria for detecting the resin filling of turquoise, an advanced treatment that reduces porosity and can dramatically improve appearance and stability.
How to Calculate Color from Spectra of Uniaxial Gemstones
Presents a method for accurately predicting the color of a gem material when viewed in any direction as long as the polarized spectra and the viewing angle relative to the c-axis are known.
Cat’s-Eye Opal
A rare chatoyant effect is produced within play-of-color patches in a natural opal.
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.
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.
Large Type IIa Diamond from Arkansas, USA
The GIA lab in Carlsbad recently had the opportunity to examine a truly “all-American” diamond.
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.
Baroque-Era Rose Cuts of Colored Stones: Highlights from the Second Half of the Seventeenth Century
Offers a systematic evaluation of rose cuts produced for various colored stones in the latter seventeenth century, based on the examination of rare artifacts that belonged to the archbishops and prince-electors of Trier and Cologne.
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.
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.
Unusual Absorption in a Blue Flux-Grown Synthetic Sapphire
The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.
Artificial Glass Imitating a Paraíba Tourmaline
A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.
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.
A Review of Analytical Methods Used in Geographic Origin Determination of Gemstones (英语)
Geographic origin determination relies on a combination of gemological observations and advanced analytical tools. This contribution reviews the analytical methods commonly used to establish origin.
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