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Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2

Comparison of LA-ICP-MS and EPMA Data, Part 2

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Appendix 5: Simplified Tourmaline Species Classification for LA-ICP-MS Data

Simplified Tourmaline Species Classification for LA-ICP-MS Data

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Appendix 4: Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data

Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data

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Appendix 3: Calculation Method for Tourmaline Species Classification Used Here

Calculation Method for Tourmaline Species Classification Used Here

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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.

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Appendix 1: Comparison of LA-ICP-MS and EPMA Data, Part 1

Comparison of LA-ICP-MS and EPMA Data, Part 1

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Freshwater pearl samples
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.

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Inclusions in sapphire SASLR050_01.
U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic Origin

Establishes a metamorphic origin for sapphire samples from these deposits, supported by their trace-element composition and inclusion characterization, including the age dating of zircon inclusions.

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A woman sits in front of a computer screen with the DiamondView to her right.
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Inside De Beers’ Lightbox Diamonds

GIA researcher analyzes and confirms that De Beers’ Lightbox diamonds are grown using the chemical vapor deposition process.

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Representative copper-bearing liddicoatite tourmaline from the study.
Article
Cuprian Liddicoatite Tourmaline

Analysis of tourmaline samples showing traditional Paraíba colors yields a surprising result.

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