A stone submitted as rough jadeite proves upon analysis to be marble, indicative of the increasing use of imitations in the jewelry market.

An overview of the Summer 2020 Gems & Gemology content.

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.

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.

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.

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。

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.

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.

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.

Palke A.C. (2020) Coexisting rubies and blue sapphires from major world deposits: A brief review of the mineralogical properties. Minerals, Vol 10, No. 5, 20 pp.

Smit K.V., Shirey S.B. (2020) Diamonds are not forever! Diamond dissolution. Gems & Gemology, Vol. 56, No. 1, pp. 148-155.

了解 GIA 如何解决业界所担忧的问题，即未经披露的实验室制造钻石和花式米粒钻仿品与天然花式米粒钻混在一起。

Sturman N., Lawanwong K., Kitdee N., Chodhry D. (2020) Vietnam: Shell nuclei, pearl hatcheries, and pearl farming. Gems & Gemology, Vol. 56, No. 3, pp. 402-415.

Vertriest W., Palke A. (2020) Identification of opaque sulfide inclusions in rubies from Mogok, Myanmar and Montepuez, Mozambique. Minerals, Vol. 10, No. 6, 18 pp.

Zaitsev A.M., Kazuchits N.M., Kazuchits V.N., Moe K.S., Rusetsky M.S., Korolik O.V., Kitajima K., Butler J.E., Wang W. (2020) Nitrogen-doped CVD diamond: Nitrogen concentration, color and internal stress. Diamond and Related Materials, Vol. 105, Article 107794.

Zhou C.H., Tsai T.H., Sturman N., Nilpetploy N., Manustrong A., Lawanwong K. (2020) Optical whitening and brightening of pearls: A fluorescence spectroscopy study. Gems & Gemology, Vol. 56, No. 2, pp. 258-265.

关于希腊劳里厄姆古代银矿的加注文献清单

对 GIA 专家而言，网络研讨会是一种轻松分享信息并与研究人员以及宝石和珠宝爱好者社区保持联系的非正式方式。