Results 51 to 60 of about 1,753 (198)
Minerals in Afghanistan : gemstones of Afghanistan [PDF]
, 2007 Afghanistan and gemstones have been inextricably linked for 6500 years and the country remains rich in precious and semiprecious gemstone deposits (Figure 1). Lapis lazuli, mined in the Hindu Kush since the Neolithic Period, was transported along the
Benham, Antony John, McIntosh, Robert
core
The Use of Gemstones in the Chinese Community [PDF]
, 2016 This article aimed to provide documentation of information relating to local intelligence from the older generations, specifically the local intelligence of the Chinese community on gemstones.To better understand this issue, an informal interview had ...
Azmi, N. A. (Noor) +2 more
core +2 more sources
Raman Spectroscopy of Amphibole Inclusions in Emeralds
Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1228-1234, November 2025.Emeralds containing elongated amphibole inclusions from Austria, Russia, Zambia and Zimbabwe were investigated with an optical microscope and Raman spectroscopy. The inclusions have various sizes and shapes; curved inclusions are frequently observed in emeralds from Zimbabwe and rarely in those from Zambia.
Stefanos Karampelas +2 more
wiley +1 more source
Thermal Temperature Measurements of Plasma Torch by Alexandrite Effect Spectropyrometer
Advances in Optical Technologies, Volume 2010, Issue 1, 2010., 2010 An alexandrite effect spectropyrometer is used to directly measure the thermal temperature of an argon gas plasma jet from a 100 kW DC plasma torch, and the directly measured thermal temperature of the plasma is 11178 ± 382 K. By using the spectral correction function to delete the spectral lines and to correct its underlying spectrum of the relative ...
Peir-Jyh Wang +3 more
wiley +1 more source
Gemological and Mineralogical Characteristics of Emerald from Ethiopia
Crystals, 2023 Ethiopia has been gaining attention in recent years as an emerging source of high-quality emerald. Ethiopian emerald samples with different colors ranging from dark green to light green were selected to study the gemological properties, chemical ...
Zixuan Huang +3 more
doaj +1 more source
Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1235-1253, November 2025.This study presents the gemological analysis of 25 garnets from Hellenistic and Roman jewellery in the Archaeological Museum of Thessaloniki using mobile Raman spectroscopy and micro‐EDXRF. The garnets are classified into three geochemical clusters, with notable differences in distribution between Thessaloniki and Pydna, suggesting distinct trading ...
Maria Nikopoulou +8 more
wiley +1 more source
The Pace di Siena and its Gems
Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1254-1278, November 2025.For the first time, the gems of the Pace di Siena, a rare en ronde bosse enamel preserved in Arezzo (Italy), have been analyzed using a transdisciplinary approach. The combination of gemmology and Raman spectroscopy has led to the identification of blue sapphires and pink spinels, contradicting previous historical classifications.
Stefania Martiniello +6 more
wiley +1 more source
CrystalsThe Longido region (Tanzania) hosts a distinct corundum–zoisite paragenesis, renowned for its ornamental value and geological significance as a tracer of Pan-African tectonothermal events.
Ling Yang +4 more
doaj +1 more source
Crystals, 2023 Fluorite has been attracting the attention of gemstone mineralogists because of its rich color and excellent fluorescence properties. This paper studied fluorite with three color types (blue, green, and white) and five blue-purple fluorites with an ...
Yang Liu +5 more
doaj +1 more source
Enhanced metrology using preferential orientation of nitrogen-vacancy centers in diamond [PDF]
, 2014 We demonstrate preferential orientation of nitrogen-vacancy (NV) color centers along two of four possible crystallographic axes in diamonds grown by chemical vapor deposition on the {100} face.
Bar-Gill, N. +8 more
core +1 more source