Optimizing Face-Up Appearance in Colored Gemstone Faceting
How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.
Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
Nephrite Jade from Val Malenco, Italy: Review and Update
Analysis of 21 rough and gem-quality samples offers an update on the composition and properties of this pale green gem from the Italian Alps.
钻石的光学缺陷：快速参考表 (英语)
A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.
Orangy Pink Coated "Soft Coral"
A coral specimen that was coated—not dyed—with a coloring agent only on the surface, an unusual method evidenced by microscopic features.
Atypical Freshwater Cultured Pearls with Damaged Nacre
Examination of four baroque-shaped pearls with damaged nacre layers.
黄色“好望角”彩钻中发现鱼状内含物 (英语)
A recent lab examination at GIA New York revealed an inclusion in a rectangular Fancy Yellow called "pareidolia," which means it was a resemblance of the scales and form of a fish.
Rare Faceted Neptunite
Raman spectroscopy reveals orangy red neptunite in identification of a 11.78 ct faceted “black” octagonal modified step-cut stone.
Jewels from Imperial St. Petersburg
By Ulla Tillander-Godenhielm, 295 pp., illus. publ. by Unicorn Press, London, 2012. US$80.00
Green Kyanite
At the Riverpark Inn show in Tucson, gem dealer Tom Schneider (San Diego, California) exhibited a parcel of kyanite displaying an unusual saturated yellowish green color.
Imitation Larimar
Strands of Tiny Akoya Keshi Pearls
A Large Irradiated Green-Yellow Diamond
Unusual Curved Color Zoning In Emerald
Agates of the Teufelskanzel Near Oberthal, Saarland, Germany
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in Lapis, Vol. 38, No. 5
Blue Spinel Crystals in the MgAl2O4-CoAl2O4 Series, Part I: Flux Growth and Chemical Characterization
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in American Mineralogist, Vol. 97, No. 11-12
Growth Strategy for Controlling Dislocation Densities and Crystal Morphologies of Single Crystal Diamond by Using Pyramidal-Shape Substrates
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in Diamond and Related Materials, Vol. 33.
Infrared Microspectroscopy of Natural Argyle Pink Diamond
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in Diamond and Related Materials, Vol. 23.
Internal Texture and Syngenetic Inclusions in Carbonado
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in The Canadian Mineralogist, Vol. 51, No. 1.
China Market: The New Frontier
From the Summer 2013 issue of G&G, a brief overview and commentary on the article featured in Diamond World, Vol. 40, No. 2
.jpg "YMAL GIA Ed")
