Optimizing Face-Up Appearance in Colored Gemstone Faceting
How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.
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.
ダイヤモンド中の光学的欠陥：早見表 (英語)
A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.
Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
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.
ファンシーイエロー・ケープダイヤモンドの中に魚のような内包物を発見 (英語)
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.
Turquoise-Rock Crystal Composite
Examination of a faceted rock crystal backed by a slice of turquoise—an obvious but unusual combination of gem materials.