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Gemological Analysis of Lightbox CVD-Grown “White” Diamonds
Lightbox, a De Beers company, has begun selling “white,” pink, and blue CVD laboratory-grown diamonds at a flat rate of $800 per carat.
Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors
Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties.
Coated Pink Synthetic Moissanite
A pink synthetic moissanite is coated with a thin colored film, raising questions about the natural origin of its color.
Nominal Type IaB Diamond with Detectable Uncompensated Boron
Examination of a type IaB diamond that exhibited instantaneous 2803 cm–1 FTIR absorption shortly after exposure to an ultra-short-wave UV source.
Single HPHT Synthetic Diamond Mixed in Natural Diamond Ring
Single HPHT laboratory-grown diamond identified in a ring containing 194 natural diamonds.
Synthetic Moissanite Coated with Diamond Film Imitating Rough Diamond
A rough sample submitted as diamond is proven to be a synthetic moissanite with a thin diamond coating.
Sulfur isotopes in diamonds reveal differences in continental construction
Smit K.V., Shirey S.B., Hauri E.H., Stern R.A. (2019) Sulfur isotopes in diamonds reveal differences in continental construction. Science, Vol. 364, No. 6438, pp. 383-385.
Evaluating mechanisms for eclogitic diamond growth: An example from Zimmi Neoproterozoic diamonds
Smit K.V., Stachel T., Luth R.W., Stern R.A. (2019) Evaluating mechanisms for eclogitic diamond growth: An example from Zimmi Neoproterozoic diamonds (West African craton). Chemical Geology, Vol. 520, pp. 21-32.
Season’s Sales: US Up 4% to 5%, But China Continues to Lag
The U.S. holiday season saw strong sales, but China continues to struggle. Plus: diamond market report and lab-grown diamond sales.
systematics of fluid-rich ‘fibrous’ diamonds
Timmermann S., Yeow H.L., Honda M., Howell D., Jaques A.L., Krebs M.Y., Woodland S., Pearson G.D., Avila J.N., Ireland T.R. (2019) U-Th/He systematics of fluid-rich ‘fibrous’ diamonds – Evidence for pre- and syn-kimberlite eruption ages. Chemical Geology, Vol 515, pp. 22-36.
US Holiday Season Opens Well, Despite Volatile Markets
The U.S. holiday shopping season is looking positive, despite signs that an economic slowdown may be coming in 2019. Plus, more auction sales records.
Colored Stones and Pearls | Gems & Gemology
Abstracts of speaker presentations from the “Colored Stones and Pearls” session of GIA’s 2018 International Gemological Symposium.
