History of Emerald Mining in the Habachtal Deposit of Austria, Part II
The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.
"The Ethics of Jewelry" at MetFridays
A summary of “The Ethics of Jewelry” panel, held at New York’s Metropolitan Museum of Art on January 25, 2019.
A New Method for Determining Gem Tourmaline Species by LA-ICP-MS
Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.
The Hidden Beauty of Amber: New Light on an Old Subject
The surprising inner world of inorganic inclusions in amber is explored through the use of polarized light and microscopic techniques.
Acicular Troughs Coincident with Green Stains on Rough Diamond Surface
The author acquired an alluvial rough diamond from Guyana showing unique surficial features that do not appear to have been documented elsewhere.
Natural Radioactivity in Select Serpentinite-Related Nephrite Samples: A Comparison with Dolomite-Related Nephrite
Uses gamma-ray spectrometry to directly measure internal radioactivity in green nephrite from deposits in Poland, Russia, Canada, and New Zealand.
Etch Marks, Negative Crystals, and Etch Tubes in Spinel from Madagascar
A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.
Appendix 1: Comparison of LA-ICP-MS and EPMA Data, Part 1
Investigations into Corundum and Beryl Color, Jade Artistry, the Chivor Emerald Mine’s History, and Swiss Rhodonite…
Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2
Appendix 3: Calculation Method for Tourmaline Species Classification Used Here
Appendix 4: Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data
Appendix 5: Simplified Tourmaline Species Classification for LA-ICP-MS Data
Natural Blister From Entombment Of A Pearlfish Within A Pinctada Maxima Shell
Derek Katzenbach: Faceter, Gem Artist, Custom Jeweler
“Rainbow Lattice” from Australia
One of the most striking materials encountered in the Riverpark Inn (Pueblo) Gem Show was “rainbow lattice.”
Preview of Nature Art Science with Paula Crevoshay
Unheated and Unusual Colors
Update on the Green Dragon Demantoid Mine in Namibia
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