Appendix 4: Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data
Appendix 3: Calculation Method for Tourmaline Species Classification Used Here
Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2
Provenance Discrimination of Freshwater Pearls by LA-ICP-MS and Linear Discriminant Analysis (LDA)
Investigates trace-element chemistry of freshwater natural pearls from North America and China with LA-ICP-MS and uses LDA to identify their origins.
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.
Appendix 5: Simplified Tourmaline Species Classification for LA-ICP-MS Data
Recycled Gemstones from Perpetuum Jewels
A wholesaler supplying the bridal market with recycled gemstones and antique cuts shares his thoughts on the market and on responsible practices.
CIBJO Blue Book and “Do’s and Don’ts” Guide on Responsible Sourcing
The World Jewellery Confederation (CIBJO) released the first edition of the Responsible Sourcing Book in January 2019.
The Rock Hound: Muzo Emeralds and Ethical Practices
Susi Smither discusses her sustainable, responsible, and ethically based business practices.
Derek Katzenbach: Faceter, Gem Artist, Custom Jeweler
Jeff Hapeman: Stories from a Gem Cutter
Jeff Hapeman of Earth’s Treasury (Westtown, Pennsylvania) loves a gemstone with a good story.
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.
Sourcing Stones with Columbia Gem House
Thoughts from a longtime Tucson exhibitor on responsible practices and the changing market trends.
The Granada Gallery
Thoughts on the Chinese and Japanese Gem Markets
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.”
Potentate’s Montana Sapphire Mine: An Interview with Warren Boyd
An update on the activity at Potentate’s Montana deposits.
Gem Legacy: A Nonprofit for East African Communities
A gem dealer gives back to the mining communities that have supplied gems over the course of his career.
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