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2024

Gemmological Characterisation of Emeralds from Musakashi, Zambia, and Implications for Their Geographic Origin Determination

Gemmological Characterisation of Emeralds from Musakash […]

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Authors

  • H.A.O. Wang
  • M. Wälle
  • M.S. Krzemnicki
Research Articles
EmeraldGemmologyGeochemistryOrigins
2022

Paraiba or Not? Cu-bearing Tourmaline with a Distinct Fe Concentration

Paraiba or Not? Cu-bearing Tourmaline with a Distinct F […]

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Authors

  • H.A.O. Wang
  • M.S. Krzemnicki
Research Articles
GeochemistryTourmaline
2022

Gemtof successfully passed G-Chron 2019 proficiency test on zircon U-Pb dating

The quality and consistency of analytical data is important for gem labs in order to provide replicable results to gemmologists over a long period of time. In addition, the accuracy compared to internationally recognised standards allows us to perform inter-lab comparisons or track instrument performance and tr

研究進展
GeochemistryMethods
2022

To be, or not to be, that is the question: chrysoberyl versus alexandrite

The mineral chrysoberyl BeAl₂O₄ is a highly appreciated gemstone due to its rarity, brilliance, and beauty and comes in attractive colours commonly ranging from colourless (chemically pure) to yellow, yellowish green, green, and brownish green to dark brown, mostly related to the presence of iron in its cry

研究進展
GeochemistryOther Gemstones
2021

Colour varieties of gems – where to set the boundary?

by Dr. M.S. Krzemnicki, first published in Facette 26 ( […]

研究進展
GemmologyGeochemistry
2021

Diamonds as a window into the earth

by Dr. L. Speich, first published in Facette 26 (M […]

研究進展
DiamondGeochemistry
2021

New statistical methods for analysis of gemstones

Based on real case studies on sapphire and emerald specimens, we here present how a simultaneous multi-element approach assists origin determination. Instead of pre-defining a list of isotopes in advance, routine analysis of blue sapphires using LA-ICP-TOF-MS detects rarely occurring trace elements such as bery

研究進展
GemmologyGeochemistryMethods
2021

A New Type of Emerald from Afghanistan’s Panjshir Valley

A New Type of Emerald from Afghanistan’s Panjshir Valle […]

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Authors

  • H.A.O. Wang
  • M.S. Krzemnicki
  • S. Bueche
Research Articles
EmeraldGeochemistryOrigins
2021

Multi-element analysis of minerals using laser ablation inductively coupled plasma time of flight mass spectrometry and geochemical data visualization using t-distributed stochastic neighbor embedding: case study on emeralds

Multi-element analysis of minerals using laser ablation […]

Authors

  • H.A.O. Wang
  • M.S. Krzemnicki
Research Articles
EmeraldGeochemistry
2021

Rare Earth Elements in Danburites

The calcium-boron-silicate danburite is a rather rare c […]

研究進展
GeochemistryOther Gemstones

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