A Variety of Colored Stones from Mayer & Watt
Mother-and-son team Laurie and Geoffrey Watt (Mayer & Watt, Maysville, Kentucky) noted that while there were plenty of customers at the AGTA show this year, the formula for success was a wide selection of materials and competitive pricing.
2019 Jewelry Industry Summit
The third Jewelry Industry Summit, held in Tucson February 2–3, revealed the successful implementation of several initiatives mapped out since the conference’s inception in 2016.
Studies on Tourmaline, Sapphire, Cultured Pearl, and a Reliquary of Legend…
Jewelry Development Impact Index
The Jewelry Development Impact Index (JDI), one of the initiatives from the second Jewelry Industry Summit in January 2017, has become the flagship project of the Minerals, Materials and Society (MMS) program at the University of Delaware. Patricia Syvrud, development manager of MMS, discussed the program, which she calls a “road map to responsibility.”
Appendix 3: Calculation Method for Tourmaline Species Classification Used Here
Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2
Native Copper Inclusions in Indonesian Purple Chalcedony
Indonesian purple chalcedony containing interesting native copper inclusions is a first for the Carlsbad lab.
CVD Layer Grown on Natural Diamond
A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.
Diamonds from the Deep: How Old Are Diamonds? Are They Forever?
The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.
Trapiche Emerald from Colombia
The examination of a nearly complete trapiche emerald crystal–which are difficult to obtain–is consistent with the findings of previous studies.
“Rainbow Lattice” from Australia
One of the most striking materials encountered in the Riverpark Inn (Pueblo) Gem Show was “rainbow lattice.”
Appendix 1: Comparison of LA-ICP-MS and EPMA Data, Part 1
Appendix 5: Simplified Tourmaline Species Classification for LA-ICP-MS Data
Appendix 4: Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data

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.
Potentate’s Montana Sapphire Mine: An Interview with Warren Boyd
An update on the activity at Potentate’s Montana deposits.
Lazurite in Spinel
Spinel is often inclusion free but occasionally showcases unusual inclusions.
Chatoyant Quartz/Tourmaline Doublet
A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.
Ponderosa Sunstone Update
The president of Oregon’s Desert Sun Mining and Gems provides the outlook for activity at the Ponderosa sunstone mine.
Low-Fe, High-V Color-Change Burmese Sapphire
The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

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