Quench-Crackled Dyed Blue Chalcedony Resembling Larimar
Raman spectroscopy confirms sea-blue beads with a similar appearance to Larimar are actually quench-crackled chalcedony.
Multiple Radiation Stains Suggest Interesting Geological Residency
A rough diamond crystal weighing 4.05 ct was observed with radiation staining on its surface.
Hydrogen and Oxygen Stable Isotope Ratios of Dolomite-Related Nephrite: Relevance for Its Geographic Origin and Geological Significance
Examines the effectiveness of hydrogen and oxygen isotopes in discriminating dolomite-related nephrites from the four most important occurrences worldwide.
Negative Crystal Containing a Mobile CO2 Bubble in Blue Sapphire Heated with Pressure
A carbon dioxide bubble enclosed within a negative crystal in a pressure-heated blue sapphire moves when gently heated.
Unusually Shaped Rutile Crystal Inclusions in Russian Emerald
Needle-like inclusions in an emerald crystal from the Mariinsky Priisk mine may be a new indicator of Russian origin.
Finders, Keepers: Field Trip to Crater of Diamonds, USA
There’s only one place on earth where the general public can prospect for diamonds directly from a primary kimberlite pipe: Crater of Diamonds State Park.
Fossil Ivory Update with Lee Downey
Lee Downey, owner of Artifactual (Tucson, Arizona), spoke with us in early 2020 about his 35 years in the fossil ivory carving trade and the impact of ivory bans on his business.
The “Fragility of the Eternal” Kunzite: Origin, Cutting, and Identification
A master gem carver bases his latest design off a stunning stained glass window when attempting the world’s largest known cut kunzite.
Greenish Blue Glass Imitating Gem Silica
Gem silica, also known as “chrysocolla chalcedony,” is considered the most valuable variety of chalcedony.
Marble Imitation of Jadeite Rough
A stone submitted as rough jadeite proves upon analysis to be marble, indicative of the increasing use of imitations in the jewelry market.
Occurrence of Petrified Woods in the Russian Far East: Gemology and Origin
Scientists in Russia construct an origin story through the analysis of petrified wood popularly used in the souvenir trade.
Purplish Pink Diaspore Reportedly from Afghanistan
Diaspore, an orthorhombic aluminum oxide hydroxide mineral with the formula AlO(OH), is a relative newcomer to the jewelry scene, with some stones possessing a captivating ability to change color between pale green, yellow, pink, and purple when viewed in different sources of light.
Novel configurations of VN4 and VN4H defects in diamond platelets: Structure, energetics and vibrational properties
Gu T.T., Ritterbex S., Tsuchiya T., Wang W. (2020) Novel configurations of VN4 and VN4H defects in diamond platelets: Structure, energetics and vibrational properties. Diamond and Related Materials, Vol. 108, Article 107957.
Deep carbon through time: Earth’s diamond record and its implications for carbon cycling and fluid speciation in the mantle
Howell D., Stachel T., Stern R.A., Pearson D.G., Nestola F., Hardman M.F., Harris J.W., Jaques A.L., Shirey S.B., Cartigny P., Smith K.V., Aulbach S., Brenker F.E., Jacob D.E., Thomassot E., Walter M.J., Navon O. (2020) Deep carbon through time: Earth’s diamond record and its implications for carbon cycling and fluid speciation in the mantle. Geochimica et Cosmochimca Acta, Vol. 275, pp. 99-122.
GIA 推出更详细的实验室制造钻石证书
加利福尼亚州卡尔斯巴德– 10 月 13 日 — 随着消费者对实验室制造钻石越来越感兴趣，GIA（美国宝石研究院）进一步提升其消费者保护使命，推出了 GIA 实验室制造钻石证书 (LGDR) — 包括适用于实验室制造钻石的四种新版数字证书（仅提供数字版），证书中包含 4C 颜色和净度规格。而以前，GIA 的实验室制造钻石证书使用的是描述性术语和等级范围。
An evaluation of the potential for determination of the geographic origin of ruby and sapphire using an expanded trace element suite plus Sr-Pb isotope compositions.
Krebs M.Y., Hardman M.F., Pearson D.G., Luo Y., Fagan A.J., Sarkar C. (2020) An evaluation of the potential for determination of the geographic origin of ruby and sapphire using an expanded trace element suite plus Sr-Pb isotope compositions. Minerals, Vol. 10, No. 5, 37 pp.
Spectroscopic features of natural and HPHT-treated yellow diamonds
Lai M.Y., Breeding C.M., Stachel T., Stern R.A. (2020) Spectroscopic features of natural and HPHT-treated yellow diamonds. Diamond and Related Materials, Vol. 101, Article 107642.
Yellow diamonds with colourless cores – Evidence for episodic diamond growth beneath Chidliak and the Ekati mine, Canada
Lai M.Y., Stachel T. Breeding C.M., Stern R.A. (2020) Yellow diamonds with colourless cores – Evidence for episodic diamond growth beneath Chidliak and the Ekati mine, Canada. Mineralogy and Petrology, Vol. 114, No. 2, pp. 91-103.
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